let's go through the years
1045 - 95 <--- 1 year 1045 - 95(1)
1045 - 95 - 95 <--- 2 year 1045 - 95(2)
1045 - 95 - 95 - 95 <--- 3rd year 1045 - 95(3)
1045 - 95 - 95 - 95 - 95 <---- 4th year 1045 - 95(4)
1045 - 95 - 95 - 95 - 95 - 95 <--- 5th year 1045 - 95(5)
thus
1045 - 95(t) <--- after "t" years, where t > 0
so the price P = 1045 - 95t
when does it reach 0? when P = 0
