At the produce counter, 71⁄5 pounds of seedless grapes cost $12.89. how much would 3 pounds cost?

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

If 20% of a number is 35, what is 50% of that number?

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9