1.

Rs 9000 becomes Rs 18000 at SI in 8 years . Find the rate of interest .

Answer»

Principal = Rs. 9000 

Amount = Rs. 18000

Time = 8 years

S.I = A - P

= 18000 - 9000 

= 9000

S.I = (P × R × T)/100

9000 = (9000 x R x 8)/ 100

9000 x 100 = 72000 x R

900000 = 72000 x R

900000/ 72000 = R

25/2 = R

R = 12.5 %



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