Question

rs. 1200 amounts to rs. 1632 in 4 years at a certain rate of simple interest. if the rate if interest is increased by 1%, it would amount to how much?

Answer 1

Si for 4 years =1632-1200=432

SI for 1 year =432/4=108

Rate for 1 year= (SI/Sum)*100=(108/1200)*100=9%

increased rate = 9+1=10%

Using Unitary method

If at 9% SI was 108

at 1% SI will be 108/9=12

at 10% (increased rate)SI will be 12*10=120 for 1 year

Si will be 120*4=480 for 4 years

Amount after 4 years =1200+480=1680