Out of 5 women and 4 men a committee of three members is to be formed in such a way that at least one member is a woman. In how many different ways can it be done ?

B and C together can complete a work in 8 days, A and B together can complete the same work in 12 days and A and C together can complete the same work in 16 days. In how many days can A, B and C together complete the same work ?

The simple interest accrued on a amount of Rs.22,500 at the end of four year is Rs.10,800. What would be the compound interest accrued on the same rate at the end of two years ?

Rajni purchased a mobile phone and a refrigerator for Rs.12,000 and Rs.10,000 respectively. She sold the refrigerator at a loss of 12 per cent and mobile phone at a profit of 8 per cent. What is her overall loss/ profit ?