If 64 amount to 83.20 in 2 years what will 86 amounts to in 4 years at the same rate percent per annum(यदि 64 , 2 वर्षो में 83 .20 हो जाता है तो उसी बियाज की दर से 86 4 वर्षो में कितना होगा?)

Options

A. 1.325
B. 135.6
C. 137.6
D. None of these

Explanation

(c ) Let the rate of interest =R%
`Rightarrow` According to question
`Rightarrow` Interest in 2yrs=83.20-64=19.20
`Rightarrow R%=(S.Ixx100)/(PxxT)`
`Rightarrow R%=(19.20xx100)/(64xx2)`
`Rightarrow R%=(30)/(2)=15%`
Therefore,Amount of 86 will be in four years by 15% of interest (अतः 86 रूपए की राशि 4 वर्षो में 15 % बियाज दर से होगी)
`Rightarrow=S.I=(86xx15xx4)/(100)=516`
`Rightarrow="Principal+S.I"`=86+51.6=137.60