Hawthorne Inc. utilizes a regenerative thermal oxidizer in their manufacturing process, the maintenance cost of which has increased according to an arithmetic gradient for 5 years. The cost in year 1 was $4,300. If the interest rate is 8% per year and the present worth of the costs for a 5 -year period was $24,500, the amount of the yearly increase, G, was closest to: $994 $1,670 $945 $616 $952