At a florist shop on a certain day, all corsages sold for either $20 or $30. 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 35 percent. What was the store's actual revenue from corsages that day?
Choose the most appropriate option:  A) $320  B) $400  C) $600  D) $800  E) $1000
I am doing it elaborately, hope it will help you.   Let, No. of corsages @ $20 = x, no. of corsages @ $30 = y and revenue= r   so, 20x+30y=r.........(1)   Now,   Given the situation, 20(x+8) + 30(y-8)= r-.25r   =&gt; 20x+160+30y-240 = .75r   =&gt; 20x+30y = .75r+80............(2)   so, r = .75r+80   =&gt; r = 320   The answer is $320.
<result>A</result>
At a florist shop on a certain day, all corsages sold for either $20 or $30. 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 35 percent. What was the store's actual revenue from corsages that day?