Problema Solution
A store owner purchased twenty LED light bulbs and thirty CFL bulbs for a total cost of $660. In a second purchase, at the same prices, he purchased thirty LED bulbs and ten CFL bulbs for a total cost of $640. Find the cost of each type of light bulb.
Answer provided by our tutors
let
l = the cost of LED light bulbs per piece
c = the cost of CLF bulbs per piece
A store owner purchased twenty LED light bulbs and thirty CFL bulbs for a total cost of $660
20l + 30c = 660
In a second purchase, at the same prices, he purchased thirty LED bulbs and ten CFL bulbs for a total cost of $640
30l + 10c = 640
by solving the system of equations
20l + 30c = 660
30l + 10c = 640
we find
l = $18
c = $10
click here to see the step by step solution of the system of equations
the LED light bulb costs $18.
the CFL light bulb costs $10.