More than cars were on the road by 1930.

25 million

Explanation:

More than 25 million cars were on the road by 1930. This is extremely remarkable when we consider that the car had only been created a few years earlier. One of the developments that allowed the car to become popular was the creation of the Model T by Ford. This was the first truly affordable car, and it allowed most families to be able to buy one during the 1910s and 1920s.

on this day in 1913, henry ford installs the first moving assembly line for the mass production of an entire automobile. his innovation reduced the time it took to build a car from more than 12 hours to two hours and 30 minutes.

3 notebooks and 3 pencils packages

step-by-step explanation:

((3×1.25)+(3×2.75))=12

3×1.25=3.75

3×2.75=8.25

3.75+8.25=$12