Answer:
One year five months approx.
Explanation:
If you maintain a $30 per month saving from the $100 monthly, and let's take an average days in month to be 30days, then ,
For 1 month = $30,
For x month = $500, I.e
X month ($30) = 1 month x $500,
X month = (1 month x $500)/$30
X month = 1 month x 16.6 .
I.e the period of time (equivalent to month) that it will take you to save up to $500 to buy a new system is 16.6 months ,approx. 17 months , if 12 months equals 1 year, then 17 months equals 1 year and 5 months approx.