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 10 percent. What was the store's actual revenue from corsages that day?
Choose the correct choice from the following choices:
A) $200
B) $400
C) $600
D) $800
E) $1000
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-.1r   =&gt; 20x+160+30y-240 = .9r   =&gt; 20x+30y = .9r+80............(2)   so, r = .9r+80   =&gt; r = 800   The answer is $800.
<result>D</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 10 percent. What was the store's actual revenue from corsages that day?