Ned opens a left-handed store.  He sells left-handed mice.  They cost 30% more than normal mice.  He sells 25 a day and his store is open every day except Sunday, Thursday, and Friday.  If normal mice cost $120 how much money does he make a week?
The left-hand mice cost 120*.3=$<T>multiply(120, 0.3)=36.0 more than right-handed ones
So they cost 120+36=$<T>add(120, 36)=156
So he makes 156*25=$<T>multiply(156, 25)=3900 a day
The store is open 7-3=<T>subtract(7, 3)=4 days a week
So in a week, he makes 3900*4=$<T>multiply(3900, 4)=15600
