exam Maths Puzzle Numerical Ability

BEN IS MAKING WOODEN FOR THE NEXT ARTS AND CRAFTS SALE. EACH TOY COSTS BEN $1.80 TO MAKE. IF HE SELLS THE TOYS FOR $3.00 EACH, HOW MANY WILL HE HAVE TO SELL TO MAKE A PROFIT OF EXACTLY $36.00?

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I am absolutely speechless with this problem. I have asked everyone I know and looked for help and nothing. Please help me.

The problem is:

V=(pi)R^2h-(pi)r^2h Solve for r^2