The table shows how the cost of a tractor repair depends on the time needed for the repair.

Repair time Cost
(hours ) (dollars)
ーーーーーーーーーー
2 I 180

5 I 450

? I 630

10 I 900

20 I 1,800


Which expression can be used to find the number that is missing from the third row of the table?


A. 450➗5

B. 630➗7

C. 450➗90

D. 630➗90