please please solve it step by step with all numbers and make sure it is correct answer please

$2-18$ What sum of money will be accumulated in $40$ years if:

A$)$ $$1,000$ is invested at the end of each of the next $40$ years at a

$15\%$ rate of return compounded annually.

B$)$ $$1,000$ is invested at the end of the first year, $$1,100$ is invested at

the end of the second year and each succeeding year's investment

is $$100$ higher than the previous year's investment for $40$ years at

$15\%$ compounded annually.

C$)$ What single investment at time zero would generate the part $"A"$

future worth?