Formula help in Numbers

i need creating formula in numbers on ipad 2. in cell a1 have dollar amount of $10. in a2 , a3 have number 5 in each one. in a4 need total of a2 , a3 multiplied $10 in a1. a4 should have $100. formula accomplish task?

thank looking.

 

=(a2+a3)*a1

 

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