Converting percentage to a decimal :
50%= 50 / 100 = 0.5
What is 50% of 15
=50% * 15
=0.5 * 15
=7.5
90 x 7 = 630 square feet total
0.5 fluid ounce per sq ft
630 x 0.5 = 315 fluid ounces are needed
It is one hundred times greater, 7000= 70 x 100
67% of 1280 is 857.6 substrack it and it's = 422.4
