Question:The interest on a certain deposit at `4.5%`p.a.is Rs.`202.50` in one year.How much will the additional interest in one year be on the same deposit at`5%` 

A `Rs. 22.50` 
B `Rs. 20.25` 
C `Rs. 225` 
D `Rs. 427.50` 

+ Answer
A 

+ Explanation
Sum

`= ((100 xx 202.50)/(4.5 xx 1))`

`= Rs. 4500`.

Additional interest

`= Rs.((4500 xx 5 xx 1)/(100) - 202.50)`

`= Rs. 22.50`.

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