Sally estimated that the cost of a new fish tank would be $45. The actual cost was 37.79. what was the percent error between sally's estimate and the actual amount

Actual cost of the fish tank that Sally wanted to buy = $37.79

The price that Sally thought would have to pay for buying the fish tank = $45

Then

Amount of money miscalculated by Sally = (45 - 37.79) dollars

= 7.21 dollars

Now

Percentage of error made by Sally while calculating = (7.21/37.79) * 100

= (721/3779) * 100

= 72100/3779

= 19.079

= 19.08

So Sally made an error of 19.08% while calculating the price of the fish tank.