Whats the value of a 10-year, 10% coupon bond if opportunity cost of capital = 10%? Face value $1000

What would happen example 1, if expected inflation rose by 3%, causing opportunity cost of capital = 13%?

What would happen example 1, if inflation fell, and opportunity cost of capital declined to 7%?

Whats the YTM on a 10-year, 9% annual coupon, $1,000 par value bond that sells for $885?

Find the value of 10-year, 10% coupon, semiannual bond if opportunity cost 13%? Face value $1000