David uses $4.50 of his $6.00 to buy a sandwich what percent did he use

75%

Step-by-step explanation:

A simple formula for percentage is

part/whole = percent/100

In this case $4.50 is the part and $6.00 is the whole

So, you would divide 4.50 and 6.00 to get 0.75

Now, 0.75 is not a percentage, but a decimal

Your final step here is to cross multiply (0.75 times 100) to get your answer:

75%

4.50/6.00 equals. 75 times 100 is 75 percent