In the first year, Bobby will acquire 16 * .5 = <<16*.5=8>>8 new cars.
After the first year, he will have a total of 16 + 8 = <<16+8=24>>24 cars.
In the second year, Bobby will acquire 24 * .5 = <<24*.5=12>>12 new cars.
After the second year, he will have 24 + 12 = <<24+12=36>>36 cars in total.
In the third year, Bobby will acquire 36 * .5 = <<36*.5=18>>18 new cars.
After the third year, he will have 36 + 18 = <<36+18=54>>54 cars in total.
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