At a florist shop on a certain day, all corsages sold for either $25 or $40. If 8 of the corsages that sold for $30 had instead sold for $20, then the store's revenue from corsages that day would have been reduced by 40 percent. What was the store's actual revenue from corsages that day?  Choose the correct answer:
A) $200
B) $400
C) $600
D) $800
E) $300
I am doing it elaborately, hope it will help you.   Let, No. of corsages @ $25 = x, no. of corsages @ $40 = y and revenue= r   so, 25x+40y=r.........(1)   Now,   Given the situation, 25(x+8) + 40(y-8)= r-.4r   =&gt; 25x+200+40y-320 = .6r   =&gt; 25x+40y = .8r+120............(2)   so, r = .6r+120   =&gt; r = 300   The answer is $300.
<result>E</result>
At a florist shop on a certain day, all corsages sold for either $25 or $40. If 8 of the corsages that sold for $30 had instead sold for $20, then the store's revenue from corsages that day would have been reduced by 40 percent. What was the store's actual revenue from corsages that day?