John spends $320 buying his favorite dolls. If he buys only small Monkey dolls, which are $4 cheaper than the large Monkey dolls, he could buy 40 more dolls than if he were to buy only large Monkey dolls. How much does a large Monkey doll cost? Pick:
A) $7.2
B) $7.5
C) $8
D) $9
E) $10
A and B is not an integer. So we start with C   If large doll costs $8, then he can buy   320/8= 
<gadget id="calculator">  320/8</gadget>
<output>40</output>
40 large dolls and   320/4= 
<gadget id="calculator">  320/4</gadget>
<output>80</output>
80 small dolls.   Difference is 40, which is we wanted.   Answer $8.
<result>C</result>
John spends $320 buying his favorite dolls. If he buys only small Monkey dolls, which are $4 cheaper than the large Monkey dolls, he could buy 40 more dolls than if he were to buy only large Monkey dolls. How much does a large Monkey doll cost?