What equal-annual-payment series is required in order to repay each given present amount?

(a) Php 1.5M in four years at 7% interest compounded quarterly,

(b) Php 2.0M in five years at 8% interest compounded semi-annually,

(c) Php 2.5M in six years at 5% interest compounded annually, and

(d) Php 3.5M in 15 years at 7% interest.