<PRE><B>Question 238331</B>
Maria paid 80 cents each for some packages of cards.
 She sold all but 18 packages for $2 each, making a profit of $48.
 How many packages of cards did she buy?
:
Let x = no. of pkg of cards bought
:
Cost of the cards
c = .80x
:
Revenue from sale of cards
r = 2(x-18)
:
 rev - cost = profit
2(x-18) - .8x = 48
:
2x - 36 - .8x = 48
:
2x - .8x = 48 + 36
:
1.2x = 84
x = {{{84/1.2}}}
x = 70 pkg of cards
:
:
Is this true?
2(52) - .8(70)
104 - 56 = 48</PRE>