Marcus buys a pair of shoes that cost $35.99 plus 5.5% tax .tia buys a pair of shoes that cost 39.99 plus 9% tax .she use a coupon for 15% off her purchase .what is the difference in the total cost

NOTE: Almost all subjects have different rules regarding rounding off and significant figures. I'll be using the rules that I usually apply in school.

Marcus:

$35.99 * 5.5% = $1.98

$1.98 + $35.99 = $37.97 (Total Cost)

Tia:

Since it wasn't specified if the coupon was applied before or after tax, we're going to assume that it was applied before tax because that's usually how it works.

$39.99 * 15% = $5.9985 or $6.00

$39.99 - $6.00 = $33.99

$33.99 * 9% = $3.0591 or $3.06

$33.99 + $3.06 = $37.05 (Total Cost)

Difference in Marcus and Tia's Total Cost:

$37.97 - $37.05 = 0.92 cents