a) Make up your mind on the number of $100 payments. It looks like 12 to me.
b) You must learn to use "Basic Principles".
if r = 1 + 0.18/12 = 1.015
At the end of the year, we have
1000r^12 -24(r^12 + r^11 + ... + r^1)
You should be able to add the 12 values in the parentheses and you will nearly be done.