If function to return no. based on 2 cells?

Hi everyone,

I need help on using the If function. Basically I am trying to calculate the cost of shipments. For example, cost of sending 1 box is 150 (eg cell A3), 2 boxes is 280 (cell A4), 3 boxes is 400 (A5), 4 boxes is 500, etc upto to 10 boxes (cell A12).

What I am looking for is cell A1 to provide me the cost based on the manually entered value of cell A2, i.e. if I enter a number between 1 to 10 in cell A2, then A1 should return a number from A3 to A12, e.g. enter 3 in A2 then A1 should return 400.

Is there such a formula or do I have to enter manually the amounts into an If function?

Thanks guys an gals!