Answer:
$5.50
Step-by-step explanation:
100% of the total bill was $27.50
10% will be 100% divided by 10
10% = $27.50 ÷ 10
10% = $2.75
20% will be double 10%
20% = £2.75 × 2
20% = $5.50
x - = answer: x = +
x - = - answerx = - +
x + = - answer x = -
+x = answer x =
x - = - answer x = - +
the only equation is x + = -
