Question

radhika and niharika borrowed rupees 21000 and rupees 15000 respectively at the sum rate simple interest of 4 year. if radhika paid rupees 1440 more interest than niharika find the rate of interest per annum​

Answer 1

Answer:

Case 1: For the first two years

P=15,000,R=15%,T=2

I=15,000×15×2100=Rs4500

Case 2: For the remaining time period

P=15,000,R=20%,T=16 months

I=15,000×20×1612100

⇒I=15,000×20×161200=Rs4000.

∴ Total amount that Ravi has to pay =15,000 + 4500 + 400 = Rs 23,500