Because he’s taxed by his home planet, Mork pays a tax rate of 40% on his income, while Mindy pays a rate of only 30% on hers. If Mindy earned 4 times as much as Mork did, what was their combined tax rate? Select:
A) 32%
B) 34%
C) 35%
D) 36%
E) 38%
Let x be Mork's income, then Mindy's income is 4x.   The total tax paid is 0.4x + 1.2x = 1.6x   1.6x / 5x  0.4  + 1.2= 
<gadget id="calculator"> 0.4  + 1.2</gadget>
<output>1.6</output>
1.6x   1.6x / 5x = 0.32   The answer is 32%. 1.6  / 5= 
<gadget id="calculator"> 1.6  / 5</gadget>
<output>0.32</output>
0.32   The answer is 32%.
<result>A</result>
Because he’s taxed by his home planet, Mork pays a tax rate of 40% on his income, while Mindy pays a rate of only 30% on hers. If Mindy earned 4 times as much as Mork did, what was their combined tax rate?