RADIO X sells cheap radios for commercial use by buying surplus supplies. A surplus bag of 100 diodes costs $2.00. A surplus bag of diodes, on average, has 10% faulty diodes (the faulty diodes are thrown away, and the remaining diodes are used in production). It takes 5 diodes to make 1 circuit board. If it takes 3 circuit boards to make a radio, how much money is needed to buy diodes to make x number of radios, in dollars?
Select the correct option:
A) x/3
B) 3x
C) 2x/3
D) x
E) 3x/4
Initial cost for 1 bag of diodes = $2, but ONLY 100(1 - 0.1) = 90 are used. So the cost for 90 diodes = $2. The number of diodes for making a radio is (3 circuit boards)(5 diodes) = 15 diodes. So, the cost for diodes to make a radio is $2(15/90) = $1/3.   $x/3 =cost of diodes to make x number of radios.   x/3nswer is x/3
<result>A</result>
RADIO X sells cheap radios for commercial use by buying surplus supplies. A surplus bag of 100 diodes costs $2.00. A surplus bag of diodes, on average, has 10% faulty diodes (the faulty diodes are thrown away, and the remaining diodes are used in production). It takes 5 diodes to make 1 circuit board. If it takes 3 circuit boards to make a radio, how much money is needed to buy diodes to make x number of radios, in dollars?