Rebecca's annual income is $20,and Jimmy's annual income is $10,. By how much must Rebecca's annual income increase so that it constitutes 55% of Rebecca and Jimmy's combined income?
Choose the correct choice:
A) 8	B) 9	C) 7.77	D) 10	E) 11

Rationale: total rebecca = x + 20 ; total = x + 20 + 10 x + 20 / x + 30 = 55 / 100 therefore x = 7.77 c
Answer: C