1.

Find the rate at Simple interest, at which a sum becomes four times of itself in 15 years. ​

Answer»

ANSWER:

R = 20%

Step-by-step EXPLANATION:

Let SUM = 100

Time = 15years

Amount = 4xsum = 400

SI = A - P = 400 - 100 = 300

R = SI×100/P×T

= 300×100 / 100×15

= 20% p.a



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