In compound interest, when the interest is compounded half-yearly, the principal changes every
every month
quarterly
six months
every year
Rachna borrows Rs.12,000 at 10 per cent per annum interest compounded half-yearly. She repays Rs. 4,000 at the end of every six months. Calculate the third payment she has to make at the end of 18 months in order to clear the entire loan.
In compound interest, when the interest is compounded half-yearly, the principal changes every __________.