Number System 2 | āϏāĻ‚āĻ–ā§āϝāĻž āĻĒāĻĻā§āϧāϤāĻŋ 2


Q. A shopkeeper sold two electric fans of different brands at ₹630 each. He earned 5% profit on one fan and suffered 10% loss on the other. Find his overall profit or loss percentage. āĻĒā§ā§°āĻļā§āύ: āĻāϜāύ āĻĻā§‹āĻ•āĻžāύ⧀āϝāĻŧ⧇ āĻĻ⧁āϟāĻž āĻ­āĻŋāĻ¨ā§āύ āĻŦā§ā§°ā§‡āĻŖā§āĻĄā§° āχāϞ⧇āĻ•ā§āĻŸā§ā§°āĻŋāĻ• āĻĢ⧇āύ ₹630 āϟāĻ•āĻžāĻ•ā§ˆ āĻŦāĻŋāĻ•ā§ā§°ā§€ āϕ⧰āĻŋāϞ⧇āĨ¤ āĻāĻ–āύ āĻĢ⧇āύāϤ 5% āϞāĻžāĻ­ āφ⧰⧁ āφāύāĻ–āύāϤ 10% āĻ•ā§āώāϤāĻŋ āĻš'āϞāĨ¤ āϤ⧇āĻ“āρ⧰ āĻŽā§āĻ  āϞāĻžāĻ­ āĻŦāĻž āĻ•ā§āώāϤāĻŋā§° āĻļāϤāϕ⧰āĻž āύāĻŋā§°ā§āĻŖāϝāĻŧ āϕ⧰āĻžāĨ¤


Solution / āϏāĻŽāĻžāϧāĻžāύ













First Fan / āĻĒā§ā§°āĻĨāĻŽ āĻĢ⧇āύ


Profit = 5% (āϞāĻžāĻ­ = 5%)


Selling Price (SP) ₹105 → Cost Price (CP) ₹100{āĻŦāĻŋāĻ•ā§ā§°ā§€ āĻŽā§‚āĻ˛ā§āϝ (SP) ₹105 → āĻ•ā§ā§°āϝāĻŧ āĻŽā§‚āĻ˛ā§āϝ (CP) ₹100}


Selling Price (SP) ₹630 → Cost Price (CP) = ?



Cost Price of the first fan = ₹600 (āĻĒā§ā§°āĻĨāĻŽ āĻĢ⧇āύ⧰ āĻ•ā§ā§°āϝāĻŧ āĻŽā§‚āĻ˛ā§āϝ = ₹600)


Second Fan / āĻĻā§āĻŦāĻŋāϤ⧀āϝāĻŧ āĻĢ⧇āύ

Loss = 10% (āĻ•ā§āώāϤāĻŋ = 10%)


Selling Price (SP) ₹90 → Cost Price (CP) ₹100 (āĻŦāĻŋāĻ•ā§ā§°ā§€ āĻŽā§‚āĻ˛ā§āϝ (SP) ₹90 → āĻ•ā§ā§°āϝāĻŧ āĻŽā§‚āĻ˛ā§āϝ (CP) ₹100)


Selling Price (SP) ₹630 → Cost Price (CP) = ?



Cost Price of the second fan (āĻĻā§āĻŦāĻŋāϤ⧀āϝāĻŧ āĻĢ⧇āύ⧰ āĻ•ā§ā§°āϝāĻŧ āĻŽā§‚āĻ˛ā§āϝ) = ₹700


Total Cost Price / āĻŽā§āĻ  āĻ•ā§ā§°āϝāĻŧ āĻŽā§‚āĻ˛ā§āϝ :











Total Selling Price / āĻŽā§āĻ  āĻŦāĻŋāĻ•ā§ā§°ā§€ āĻŽā§‚āĻ˛ā§āϝ :


Overall Loss / āĻŽā§āĻ  āĻ•ā§āώāϤāĻŋ :

Loss Percentage / āĻ•ā§āώāϤāĻŋā§° āĻļāϤāϕ⧰āĻž :


Ans / āωāĻ¤ā§āϤ⧰:  Overall Loss = ₹40 (āĻŽā§āĻ  āĻ•ā§āώāϤāĻŋ = ₹40)

Overall Loss Percentage = 3.08% (āĻŽā§āĻ  āĻ•ā§āώāϤāĻŋā§° āĻļāϤāϕ⧰āĻž = 3.08%)













Ex – 14: Monthly Interest


Q / āĻĒā§ā§°āĻļā§āύ: To open "Naztaz Beauty Parlour", Nazmina and Tazmina took a loan of ₹9000 from a bank at 4% interest per annum. They decided to pay the interest every month. How much interest will they have to pay every month ? (āĻĒā§ā§°āĻļā§āύ: "Naztaz Beauty Parlour" āĻ–ā§‹āϞāĻžā§° āĻŦāĻžāĻŦ⧇ āύāϜāĻŽāĻŋāύāĻž āφ⧰⧁ āϤāĻžāϜāĻŽāĻŋāύāĻžāχ āĻāϟāĻž āĻŦ⧇āĻ‚āϕ⧰ āĻĒā§°āĻž ₹9000 āĻ‹āĻŖ āϞ'āϞ⧇āĨ¤ āĻŦ⧇āĻ‚āϕ⧇ āĻŦāϛ⧰āĻŋ 4% (per annum) āĻšāĻžā§°āϤ āϏ⧁āϤ āϞāϝāĻŧāĨ¤ āϤ⧇āĻ“āρāϞ⧋āϕ⧇ āĻĒā§ā§°āϤāĻŋ āĻŽāĻžāĻšā§‡ āϏ⧁āϤ āĻĒā§°āĻŋāĻļā§‹āϧ āϕ⧰āĻžā§° āϏāĻŋāĻĻā§āϧāĻžāĻ¨ā§āϤ āϞ'āϞ⧇āĨ¤ āϤ⧇āĻ“āρāϞ⧋āϕ⧇ āĻĒā§ā§°āϤāĻŋ āĻŽāĻžāĻšā§‡ āĻ•āĻŋāĻŽāĻžāύ āϏ⧁āϤ āĻĻāĻŋāĻŦ āϞāĻžāĻ—āĻŋāĻŦ ?)


Solution / āϏāĻŽāĻžāϧāĻžāύ


Interest on ₹100 for 1 year = ₹4 (ā§§ āĻŦāϛ⧰⧰ āĻŦāĻžāĻŦ⧇ ₹100-ā§° āĻ“āĻĒā§°āϤ āϏ⧁āϤ = ₹4)


Interest on ₹9000 for 1 year ( ₹9000-ā§° āĻ“āĻĒā§°āϤ ā§§ āĻŦāϛ⧰⧰ āϏ⧁āϤ) = (


So, Interest in 1 year = ₹360 (āĻ…ā§°ā§āĻĨāĻžā§Ž, ā§§ āĻŦāϛ⧰⧰ āϏ⧁āϤ = ₹360)


Interest in 12 months = ₹360 (⧧⧍ āĻŽāĻžāĻšā§° āϏ⧁āϤ = ₹360)


Interest in 1 month (ā§§ āĻŽāĻžāĻšā§° āϏ⧁āϤ) =


Ans / āωāĻ¤ā§āϤ⧰ : Monthly Interest = ₹30 (āĻĒā§ā§°āϤāĻŋ āĻŽāĻžāĻšā§° āϏ⧁āϤ = ₹30)


Ex –15: Simple Interest


Q / āĻĒā§ā§°āĻļā§āύ: Saving ₹3600 at Simple Interest for 5 years amounts to ₹5220. At the same rate of interest, how much money should be deposited to get an amount of ₹47,270 in 7 years ? (āĻĒā§ā§°āĻļā§āύ: ₹3600 āϟāĻ•āĻž āϏ⧰āϞ āϏ⧁āϤāϤ (Simple Interest) ā§Ģ āĻŦāϛ⧰⧰ āĻŦāĻžāĻŦ⧇ āϜāĻŽāĻž āϕ⧰āĻŋāϞ⧇ āĻŽā§āĻ  āϧāύ ₹5220 āĻšāϝāĻŧāĨ¤ āĻāϕ⧇ āϏ⧁āϤ⧰ āĻšāĻžā§°āϤ ā§­ āĻŦāϛ⧰⧰ āĻĒāĻŋāĻ›āϤ ₹47,270 āĻĒāĻžāĻŦāϞ⧈ āĻ•āĻŋāĻŽāĻžāύ āϟāĻ•āĻž āϜāĻŽāĻž āϕ⧰āĻŋāĻŦ āϞāĻžāĻ—āĻŋāĻŦ ?)


Solution / āϏāĻŽāĻžāϧāĻžāύ











1st: Find the Simple Interest / āĻĒā§ā§°āĻĨāĻŽā§‡ āϏ⧰āϞ āϏ⧁āϤ āωāϞāĻŋāϝāĻŧāĻžāĻ“āρ


Amount = ₹5220
Principal = ₹3600


Simple Interest (SI) = Amount − Principal (āϏ⧰āϞ āϏ⧁āϤ = āĻŽā§āĻ  āϧāύ − āĻŽā§‚āϞāϧāύ)



2nd: Find the Rate of Interest / āϏ⧁āϤ⧰ āĻšāĻžā§° āύāĻŋā§°ā§āĻŖāϝāĻŧ

Using the Simple Interest Formula:




Rate of Interest(āϏ⧁āϤ⧰ āĻšāĻžā§°) = 9% per annum (āĻŦāϛ⧰āĻŋ 9%)


3rd: Find the Required Principal / āĻĒā§ā§°āϝāĻŧā§‹āϜāύ⧀āϝāĻŧ āĻŽā§‚āϞāϧāύ āωāϞāĻŋāϝāĻŧāĻžāĻ“āρ

Let the required Principal [āϧ⧰āĻž āĻšāĻ“āĻ•, āĻĒā§ā§°āϝāĻŧā§‹āϜāύ⧀āϝāĻŧ āĻŽā§‚āϞāϧāύ (P)] = ₹x


Required Amount [āĻĒā§ā§°āϝāĻŧā§‹āϜāύ⧀āϝāĻŧ āĻŽā§āĻ  āϧāύ (A)] = ₹47,270


Time (āϏāĻŽāϝāĻŧ)= 7 years (ā§­ āĻŦāϛ⧰)


Rate (āϏ⧁āϤ⧰ āĻšāĻžā§°) = 9%


Simple Interest:āϏ⧰āϞ āϏ⧁āϤ⧰ āϏ⧂āĻ¤ā§ā§° :


Amount = Principal + Interest (āĻŽā§āĻ  āϧāύ = āĻŽā§‚āϞāϧāύ + āϏ⧰āϞ āϏ⧁āϤ)





x = 4727000/163 ​= 29000


Ans / āωāĻ¤ā§āϤ⧰: ₹29,000

Required Deposit (Principal) = ₹29,000 (āĻĒā§ā§°āϝāĻŧā§‹āϜāύ⧀āϝāĻŧ āϜāĻŽāĻžā§° āĻŽā§‚āϞāϧāύ = ₹29,000)






 







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