Can you please help me with this Two questions? Thanks.

Given a 6 percent interest rate, compute the present value of payments made in years 1, 2, 3, and 4 of $1,700, $2,000, $2,000, and $2,100. (Present Volume $) A perpetuity pays $100 per year and interest rates are 9.5 percent. How much would its value change if interest rates decreased to 8.0 Percent. (Change in value).Did the value increase or decrease