suppose contact lenses cost $300 for a years supply or $30 for a months supply which is less expensive to order per year paying for 12 months at one time or paying for 1 month at a time

Answer 1

To determine the less expensive option, we can compare the total cost for ordering contact lenses for a year under both options:

1. Ordering 12 months at one time:
The cost for a year's supply is $300, as given.

2. Ordering 1 month at a time:
The cost per month is $30, so the cost for 12 months would be: 12 months * $30/month = $360.

Comparing the two options, it is clear that ordering contact lenses for a year by paying 12 months at one time is less expensive, as it would cost $300 compared to $360 for paying one month at a time.