(7*2)+4=30% of money
18=30% of money
60=100% of money
6/7 of 70%= 60%
60%=36 cookies
(36-10)/2=13
13 cookies
18*20%=3.6
18-3.6=14.4
14.4
378+56.85+74.50=509.35
+10 
