At a florist shop on a certain day, all corsages sold for either $40 or $45. 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 20 percent. What was the store's actual revenue from corsages that day?  Select the correct option:
A) $200 B) $400 C) $600 D) $800 E) $1000
I am doing it elaborately, hope it will help you.   Let, No. of corsages @ $40 = x, no. of corsages @ $45 = y and revenue= r   so, 40 x+45 y=r.........(1)   Now,   Given the situation, 40(x+8) + 45(y-8)= r-.2r   =&gt; 40 x+320+45 y-360 = .8r   =&gt; 40x+45y = .8r+40............(2)   so, r = .8r+40   =&gt; r = 200   The answer is $200.
<result>A</result>
At a florist shop on a certain day, all corsages sold for either $40 or $45. 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 20 percent. What was the store's actual revenue from corsages that day?