NPV -2

A company receives a perpetuity of $20,000 per year in arrears, and pays 30% corporation tax 12 months after the end of the year to which the cashflows relate. At a cost of capital of10%, what is the after-tax present value of the perpetuity?

I got the wrong answer $140,000

AWCo needs to have $100,000 working capital in place immediately for the start of a2-year project. The amount will stay constant in real terms. Inflation is running at 10% per year, and AWCo’s money cost of capital is12%. What is the present value of the cashflows relating to working capital?

I tried to do this question. but I’m not getting the answer

AMCo wil lreceive a perpetuity starting in 2years ‘time of $10,000 per year, increasing by the rate of inflation(which is 2%).What is the present value of this perpetuity assuming a money cost of capital of 10.2%?

This one also I find it tough to answer. I don’t understand the solution given in the kit