5-80. A new machine was bought for $9,000 with a life of six years and no salvage value. Its annual operating costs were as follows: $7,000, $7,350, $7,717.50, ... , $8,933.97. If the MARR = 12%, what was the annual equivalent cost of the machine? (5.5)

(a) $7,809

(b) $41,106

(c) $9,998

(d) $2,190

(e) $9,895