Find a formula for the total cost $T of c pens
at $d each and e pencils at f cents each.
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Answer:
Let cost of each pen= y
No of pens= n
Total cost of pen= ny
Cost of each pencil= 20 cents
No of pencils= m
Total cost of pencil= 20m
Total cost of m pencils= Total cost of n pens
20m=ny
Multiply both sides by 10
200m= 10ny
10y =
10y= (100cents= 1 dollar)
cost of 10 pencils= 10y
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