John and Ingrid pay 30% and 40% tax annually, respectively. If John makes $60000 and Ingrid makes $72000, what is their combined tax rate? Choose the most appropriate option
A) 32%
B) 34.4%
C) 35%
D) 35.6%
E) 36.4%
(1) When 30 and 40 has equal weight or weight = 1/2, the answer would be 35.   (2) When 40 has larger weight than 30, the answer would be in between 35 and 40. Unfortunately, we have 2 answer choices D and E that fit that condition so we need to narrow down our range.   (3) Get 72000/132000 = 6/11. 6/11 is a little above 6/12= 1/2. Thus, our answer is just a little above 35.   Answer: 35.6%
<result>D</result>
John and Ingrid pay 30% and 40% tax annually, respectively. If John makes $60000 and Ingrid makes $72000, what is their combined tax rate?