Add or discount % formula

Hello,

I am seeking help on correction of formula. Here are the details below.

The cell B4 should display the result for all calculation.

B4 = L16+O28*B15*G16
50+100=150+*10%=165*10%=181.5

B4=181.5

I hope the above mentioned is clear to help me to solve this issue.

Please see the attached file.