i am struggling with this question can someone help me

Exercice 4: a. A financial asset generates returns of $10,000 at the end of each year for ten years. The required rate of return if 7% per year. How much must you pay to buy this asset? b. A stock pays a constant dividend of $10, starting at the beginning of year 6 (t=6). What is the present value today of the perpetuity if the required rate of return is 20%