GRE Exam Numerical Ability Arithmetic

The floor space in a certain market is rented for $15 per 30 square feet for one day. In the market, Alice rented a rectangular floor space that measured 8 feet by 15 feet, and Betty rented a rectangular floor space that measured 15 feet by 20 feet. If each woman rented her floor space for one day, how much more did Betty pay than Alice?
(A) $27
(B) $36
(C) $54
(D) $90
(E) $180

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GRE Other Question
A business owner obtained a $6,000 loan at a simple annual interest rate of r percent in order to purchase a computer. After one year, the owner made a single payment of $6,840 to repay the loan, including the interest. What is the value of r ?
(A) 7.0
(B) 8.4
(C) 12.3
(D) 14.0
(E) 16.8 If (a-b)/(a+b) = 2, and b 5 1, what is the value of a ?
(A) 1
(B) 0
(C) 1
(D) 2
(E) 3 A