4) Governmental grants in the form of reimbursements are offered to owners who undertake renovation work to make their house more energy-effective. Assume the reimbursement is of 10% when the renovation cost is between $2,000 and $5,000 (inclusive), and of 20% when it is greater than $5,000; no reimbursement is offered below $2,000. The renovation costs (in $) of 8 house owners are listed below. Owner number 1 2 3 4 5 I5 7 8 Renovation cost 3,500 1,500 2,000 6,000 3,500 4,500 8,000 9,000