Question

      please help me write an algebraic expression equation.   then solve these percent problems.

Answer 1

$p\%=\frac{p}{100}\\\\100\%-25\%=75\%=\frac{75}{100}=0.75\\\\0.75\times\ 150=\ 112.50\leftarrow answer\\=======================================\\100\%+7\%=107\%=\frac{107}{100}=1.07\\\\1.07\times3\times\ 14.99\approx\ 48.12\leftarrow answer$