A short taxi ride from Bedok MRT charges a flat boarding fee plus a distance rate. The fare in dollars is given by the expression $1.50 + 0.20d$, where $d$ is the distance travelled in kilometres. What does the number $0.20$ represent in this expression?
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Worked Solution
Step 1: The expression has two parts: a constant 1.50 and a variable term 0.20d.\n
Step 2: Constants are fixed amounts. Here 1.50 is the boarding fee (it does not change with d).\n
Step 3: 0.20 is the coefficient of d, so it is the dollar amount charged for each kilometre. As d (kilometres) grows, 0.20d grows in $0.20 steps.\n
Step 4: So 0.20 represents the cost per kilometre travelled.
Answer: The cost in dollars per kilometre travelled
Correct answer: The cost in dollars per kilometre travelled
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