Answer: B
If time and principal amount remain constant, then interest rate and interest are directly proportional.
In this case, the difference in interest rate = \((12-10)\%=2\%\)
\(\therefore\) 2% of the principal = 200 rupees
or, Principal \(\times \cfrac{2}{100}=200\) rupees
or, Principal = \(200\times \cfrac{100}{2}\) rupees = \(10000\) rupees
If time and principal amount remain constant, then interest rate and interest are directly proportional.
In this case, the difference in interest rate = \((12-10)\%=2\%\)
\(\therefore\) 2% of the principal = 200 rupees
or, Principal \(\times \cfrac{2}{100}=200\) rupees
or, Principal = \(200\times \cfrac{100}{2}\) rupees = \(10000\) rupees