Kevin, a housing developer offered Amy, a roof installer, $7200 per house for the four houses upon which Amy will install a roof. Kevin proposed terms of $3500 in advance, the balance on completion and work to commence within the next two weeks. a. The status of the offer and response if Amy said "No." b. The status of the offer and response if Amy said, "Yes, but I request $4,000 in advance, not $3500."