Solve the Problem $24 - 4 n$ Hundred Fewer Than the Previous Year

Solve the problem.
-In 2007 , business analysts estimated that the number of skilled carpenters working in a certain city was decreasing each year. The number of employed carpenters in a given year is $24 - 4 n$ hundred fewer than the previous year. Find the decrease in employed carpenters in 2010, if year 1 is $2007 .$ Find how many total hundred carpenters became unemployed from 2007 through 2010 .

A) 12 hundred carpenters; 48 hundred carpenters
B) 8 hundred carpenters; 36 hundred carpenters
C) 8 hundred carpenters; 56 hundred carpenters
D) 8 hundred carpenters; 48 hundred carpenters