The cost of college, pregnancy or other expenses after age 18 were not factored in. The overall cost is a good deal higher than figures estimated in 1960 by the USDA's first Cost of Raising A Child report.
It's reasonable, but there are options. A garage door opener is anywhere from $75 and up for a single door and $120+ for the double.... Installation price depends on who does it. I think Sears and/or HD charges around $250+, but you have to buy the GDO from them... @_@ I'd say do it yourself. The contractor is out to make more money, guaranteed.
Find here detailed information about install garage door costs. Average cost to install a garage door is about $500 - $800. Find here detailed information about install garage door costs.