Because he’s taxed by his home planet, Mork pays a tax rate of 45% on his income, while Mindy pays a rate of only 20% on hers. If Mindy earned 4 times as much as Mork did, what was their combined tax rate?	Choose the correct answer:
A) 22%
B) 25%
C) 28%
D) 31%
E) 34%
Let x be Mork's income, then Mindy's income is 4x.   The total tax paid is 0.45x + 0.8x = 1.25x   1.25x / 5x  0.45  + 0.8= 
<gadget id="calculator"> 0.45  + 0.8</gadget>
<output>1.25</output>
1.25x   1.25x / 5x = 0.25   The answer is 25%. 1.25  / 5= 
<gadget id="calculator"> 1.25  / 5</gadget>
<output>0.25</output>
0.25   The answer is 25%.
<result>B</result>
Because he’s taxed by his home planet, Mork pays a tax rate of 45% on his income, while Mindy pays a rate of only 20% on hers. If Mindy earned 4 times as much as Mork did, what was their combined tax rate?