percent means parts ouf of 100 so x%=x/100 40%=40/100=0.4 'of' means multipy
therefor 40% of 85=0.4 times 85=34 25% of 64 =0.25 times 64=16 10% of 150 =0.1 times 150=15 70% of 30 =0.7 times 3=21 50% of 400=0.5 times 400=200 15% of 200
=0.15 times 200=30