Question

the difference between the compound interest and the simple interest on a sum at 10 % per annum for 3 years is rupees 155. the sum in rupees is ?​

Answer 1

Answer-500 Rs

explain with short trick-

SI= 10×3=30%

CI=33.1%. [by trick( a+a²/100)]

different of ci and si

=33.1-30

=3.1%

so,

3.1%=155

100%=(155/31)×100

=500Rs