Just think 200% = 2x, so 2x of 18 = 36. Now for the 20%. Thats one fifth, so just do 18/5 and you have your answer when you add those together
85 * 0.20 = 17
85 - 17 = $68
He paid $68 for the jacket
30 is the value of P
Steps:
A perfect square follows the pattern
8x10 = 80
4x4 = 16
2x4 divided 2 = 4
80+16+ 4 = 100
I think that 30 bulbs are expected to be defective.