Mary’s annual income is $15,000 and John’s annual income is $18,000. By how much must Mary’s annual income increase so that it constitutes 70% of Mary and John’s combined income?  Choose the correct choice from the following options
A) $3,000 B) $4,000 C) $7,000 D) $11,000 E) $27,000
Let Mary's income increase by x, then the equation will be   15,000 + x= (70/100)* (15,000 + x + 18000 )   15,000 + x = (14/20) * (33,000 + x)   300,000 + 20x = 14x + 462,000   6x = 162,000   x = 27,000   So, Answer will be $27,000
<result>E</result>
Mary’s annual income is $15,000 and John’s annual income is $18,000. By how much must Mary’s annual income increase so that it constitutes 70% of Mary and John’s combined income?