Question

a sum fo money become 8/5 of its self in 5 year at a certain rate of simple interest find the rate of interest

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Answer 1

Answer:

12% =Rate of Interest

Step-by-step explanation:

Given, Time= 5years

Let The Principal be Rs. 100

Amount after 5 years= Rs. (8/5)*100

                                  = Rs. 160

Interest= Amount- Principal

            = 160-100= Rs.60

Interest= (Principal*Rate*Time)/100

60= (100*Rate*5)/100

60*100=500*Rate

(60*100)/500=Rate

12% =Rate of Interest

Answer 2

Answer:

32%

Step-by-step explanation:

let the principle=x and rate=y

amount=8x/5

therefore, SI=(8x/5)-x=3x/5

$si = \frac{prt}{100}$

$\frac{8x}{5} = \frac{x \times y \times 5}{100}$

(8x/5)*(100/5)=x*y

(8x*4)/x=y

therefore, y=32%