The least number of parts both numbers can be divided into is the least common denominator of the 2 fractions which is 12
Sorry I can’t explain this very well but it would be 50 because the rate is 240:10, 240x5= 1,200, so 10x5 would get you the gallons of gasoline she uses.
$45 x .15 = $6.75 discount
$45 - $6.75= $38.25
Sales tax 6%
$38.25 x 0.6 =$ 2.29
$38.25 + $2.29 = 40.54$
Jeans total is 40.54$