Shirts are 50% off. The original price of one shirt is $60. dollars, of two shirts, at the sale price, including a 10% sales tax​

I guess, you are asking how much two shirts are costing now.

the answer is $66

Step-by-step explanation:

sales tax is always calculated from the actual sales price (and never from a list price or so).

so, the discount is 50%.

=> a shirt now costs only $30 (instead of $60).

50/100*60 = $30

now, sales tax is calculated from these $30.

=> 10% of $30 is $3

10/100*30 = $3

therefore, a single shirt costs now $30+$3 = $33 incl. sales tax.

two shirts cost therefore 2 * $33 = $66

$450 is the answer.

step-by-step explanation:

30% of 450 = 135

450-135=315

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed