Mr Tan is choosing between two car wash subscriptions for the month. 'Sparkle' charges a $25 monthly fee plus $4 per wash. 'Shine' charges $7 per wash with no monthly fee. If Mr Tan washes his car 6 times this month, which subscription is cheaper, and by how much?
Show Worked Solution
Worked Solution
Step 1: Compute Sparkle's total monthly cost.
Sparkle = $25 fixed fee + (6 washes × $4 per wash) = $25 + $24 = $49.
Step 2: Compute Shine's total monthly cost.
Shine = 6 washes × $7 per wash = $42.
Step 3: Compare the two totals.
$49 − $42 = $7. Shine costs less.
Step 4: Shine is cheaper by $7.
Answer: Shine, by $7
Correct answer: Shine, by $7
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