If bulk candy costs $10.00 a kilogram, how much will 3 pounds cost? (There are 2.2 pounds in a kilogram.)

Question

Let x equal what you are trying to find
x = ($ / purchase) Note: The unit "purchase" is made up.

Answer 1

Reciprocal factors
2.2 (lb / kg) 1/2.2 (kg / lb)
10 ($ / kg) 1/10 (kg / $)
Multiply factors
x ($ I purchase) = 10 ($ / kg) * I / 2.2 (kg / lb) * 3 (lb / purchase)
Multiply factors
x ($ / purchase) = 13.64 ($ / purchase) Cost of purchase of 3 lbs is $13.64.