Whats is the answer to 7 x 1781

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?