Question

If interest on Rs x for 2 years at R% per annum is Rs 80, then what is the interest on Rs 2x for one year at R% per annum?

Answer 1

Given :  interest on Rs x for 2 years at R% per annum is Rs 80

To Find :   interest on Rs 2x for one year at R% per annum

Solution:

SI = P * R * T /100

P = x

R = R

T = 2

SI = 80

=> 80 = x * R * 2 /100

=> 80 = 2xR/100

P = 2x

R = R

T = 1

SI = ?

=> SI  = 2x * R * 1 /100

=> SI = 2xR/100

=> SI = 80

interest  = Rs 80

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Answer 2

Answer:

Step-by-step explanation:

I=(P*R*T)/100

80=(x*2r*2)/100

80=(x*r*2*2)/100

80=(x*r*2)/20

80=(x*r)/10

80*10=x*r

800=x*r

Then

I=PRT/100

I=xx*r*1/100

I=xr/100

I=800/100

I=8