If P = D(1 + yt), rearrange the formula so that the subject is D.
P=D(1+yt)
P ÷ (1+yt) = D(1+yt) ÷ (1+yt)
P/(1+yt)=D
D=P/(1+yt)
If change the (1+yt) to other side,it will be division p. So, P = D(1+yt) P/(1+yt) = D D = P/(1+yt) This plan is more easier.Hope its can help you.