The appropriate choice for the non-event is ...
... A. The costs of sewing machines began to increase.
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Interchangeable parts generally reduce costs and increase demand (and production).
What are the situations that demonstrates demonstrates direct rule?
75 % of the drive is 0.75 x 932.4 miles which is 699.3 miles which if divided by two equals about 350 miles per day will allow her to reach her objective so the result is obtained by just doing simple math according to the total distance and the 75% and dividing the result by 2 days.
