Dobson Corp. is considering the purchase of a new piece of equipment. The cost savings from the equipment would result in an annual increase in net income of $$57,000.$ The equipment will have an initial cost of $$514,000$ and have an six year life. There is no salvage value of the equipment. The hurdle rate is $11\%.$ Ignore income taxes.

a$.$ Calculate accounting rate of return. $($Round your answer to $2$ decimal places.$)$

b$.$ Calculate payback period $($Round your answer to one decimal place.$)$