Chapter 6.2, Problem 60STP

To determine

Find the amount that to be paid for haircut.

Answer to Problem 60STP

The amount that have to pay at the parlor $\$35$ .

Explanation of Solution

Given:

It is given in the question that the price for hair cut is $\$28$ and there is also a $7\%$ tax added to the bill and she also want to give tip of $15\%$ of the total bill.

Concept Used:

In this, use the concept of doing estimation by rounding off the number to simpler numerals.

Calculation:

Here, A total of $7\%+15\%=22\%$ will be added to the tip. $22\%$ is between $20\%$ and $25\%$ , so it can be estimated that the total cost will be between $20\%and25\%$ of the bill.

Let’s round off $\$28$ to $\$30$ . So $20\%of30$ is $2$ times $10\%of30$ , which is $2\times \$3=\$6$ .

  $25\%of30$ is the same as one − fourth of $\$30$ , which is $\$7.50$ . So the total cost of $\$28$ will have an additional value that ranges from $\$6and\$7.50$ .

The total cost will be between $\$34and\$35.50$ . $\$35$ would be a good estimate.

Conclusion:

The amount that have to pay $\$35$ .