GRE Exam Numerical Ability Simple & Compound Interest

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

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GRE Other Question
List L: 2, x y
List M: 1, 2, 3, x, y
If the average (arithmetic mean) of the 3 numbers in list L is 10 3 , what is the average of the 5 numbers in list M ? Give your answer as a fraction 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