Tuition for one year at a state university is

Question

about $13,000. Devon would like to attend this
university and will save money each month for the
next 4 years. His parents will give him$5,200 for
his first year of tuition. Which plan shows the
minimum amount of money Devon must save to
have enough money to pay for his first year of
tuition?
A Save $108.33 per month for the next 4 years
B Save $162.50 per month for the next 4 years
C Save $650.00 per month for the next 4 years
D Save $270.83 per month for the next 4 years

Answer 1

13,000 - 5200 = 7800
7800 / 4 = 1950
1950 / 12 = 162.50

Plan B

Answer 2

No rate of interest is given, thus the question cannot be answered properly