Find the sum for which $ 1,250.00 will amount to $ 2,031.25 at 12.5% per annum simple interest.

If log\(_3^{2x - 1}\) = 5, find the value of x

The population of a town increases by 3% every year. In the year 2000, the population was 3000. Find the population in the year 2003.

A  trader gave a change of # 540.00 instead of # 570.00 to a customer. Caculate the percentage error.

The interior angle of a regular polygon is 168º. Find the number of sides of the polygon.