Question

Vinod borrowed some money for 4 years at simple interest the rate of interest is 10 p.c.p.a If he returned 21,000 altogether at the end of 4 years, how much had he borrowed

Answer 1

Answer:

15000

Step-by-step explanation:

Let the principal be x

Then,x+(x×4×10/100)=21000

Or,x+2x/5=21000

Or,5x+2x/5=21000

Or,7x/5=21000

Or,x=21000×5/7=15000

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Answer 2

Answer:

n=4 yrs.

r=10%p.a.

P=?

I= P×r×n/100

= P×10×4/100

= 2/5 P

sum = I + P

21000 = 2/5P + P

21000 × 5 = 2P+5P

21000 × 5 = 7P

P= 21000×5/7

P= 3000×5

•°• P=Rs. 15000

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