A taxi from HarbourFront to Sentosa charges a $4 flag-down fee plus $0.55 for every kilometre travelled. The total fare, in dollars, for a journey of $d$ kilometres is given by $f = 4 + 0.55d$. In this expression, what does the term $0.55d$ represent?
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Worked Solution
Step 1: Identify the two parts of the expression. The constant term 4 is the part that does NOT depend on d - that is the flag-down fee.\n
Step 2: The term 0.55d depends on d (the distance). The 0.55 is the rate per kilometre, and d is the number of kilometres.\n
Step 3: When you multiply a rate ($/km) by a distance (km), the units become dollars. So 0.55d gives the total cost of the distance travelled, in dollars.\n
Step 4: Therefore 0.55d represents the total cost of the distance travelled, in dollars.
Answer: The total cost of the distance travelled, in dollars
Correct answer: The total cost of the distance travelled, in dollars
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