Answer:
B.
Step-by-step explanation:
Assuming the cost increased linearly is equivalent to assuming the cost increased at a constant rate. Because the cost of the clothing increased from $620 to $1,000 in 10 years, the constant rate is equal to
= ($1,000 - $620)/10
= $38 per year
Therefore, the cost of the family’s clothing in 1991 (6 years after 1985) is:
$620 + (6 years)($38 per year)
= $620 + $228
= $848
