Show your work.( not using excel function but try to use formula)

A bond dealer purchased the following bonds with a yeild to maturity of 8 %. Afterwards, yeild fell to 7%. Complete the table bellow:

Price at 8%, Price at 7%, percentage change

1) 10 year, 10% coupon

2) 10 year zero

3) 5 year zero

4) 30 year zero