Calls made in a 3 day telephone fund raiser at a rate of 10 calls per hour

I'm not sure if this is what you meant, but if there was a 3-day fundraiser and they got 10 calls per hour. The answer would be 3x24=72. There are 72 hours in three days. 10x72=720. In 3 days the fundraiser was called 720 times.

I’m guessing that the answer is c, but i’m not sure which grid is being talked about. since 5x5= 25 and 3x3= 9 (which there are no answers for). a is not right because while the ratio is the same, 6/25= 0.24 which is equal to 24% not 30%.