At $5.55 per pound, what is the value of 4 pounds of roast beef?

Question

At $5.55 per pound, what is the value of 4 pounds of roast beef?

Answer 1

This problem seems very clearly a golden opportunity to use common sense.

l lb cost $5.55

2 lbs cost two times as much, namely $11.10

3 lbs cost 3 times as much, et cetera, et cetera, etc.