If bulk candy costs $4.00 a pound, how much will '/4 pound cost?
Let x equal what you are trying to find
x = ($ / purchase) Note: The unit "purchase" is made up.
Reciprocal factors
4 ($ / lb) 1 /4 (lb / $)
Build an equation
x ($ / purchase) = 4.00 ($ /1b) * 1/4 (lb / purchase)
Multiple factors
x ($ I purchase) = 1.00 ($ / purchase) Cost of purchase of'/ lb is $1.00.
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