The monthly installment of a recurring deposit account is ₹ 2400. If the account is held for 1 year 6 months and its maturity value is ₹ 47,304, find the rate of interest.

The maturity value of a recurring deposit account is ₹ 42,400. If the account is held for 2 years and the rate of interest is 10% per annum, find the amount of each monthly installment.

A man invests equal amounts of money in two companies A and B. Company A pays a dividend of 15% and its ₹ 100 shares are available at 20% discount. The shares of company B has a nominal value of ₹ 25 and are available at 20% premium. If at the end of one year, the man gets equal dividends from both the companies, find the rate of dividend paid by company B.

A sum of ₹ 54000 is invested partly in shares paying 6% dividend at 40% premium and partly in 5% shares at 25% premium. If the nominal value of one share in each company is ₹ 100 and the total income of the man is ₹ 2,240, find the money invested in the second company.