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You can buy contact lenses for $20 per month OR $200 per year (12 months).

Which is the better deal?

To find out, compare the unit rates.

Remember: to calculate a unit rate, simply turn the information into a ratio fraction, then divide the top number (the numerator) by the bottom number (the denominator).

Here is a calculator for you to use, or you can use the calculator in your computer:

1 answer

To determine which option is the better deal, we will calculate the cost per month for both options.

  1. Monthly option:

    • Cost: $20 per month
    • Unit rate: $20 per month

  2. Yearly option:

    • Cost: $200 per year
    • To find the monthly rate, divide the annual cost by 12 months: \[ \text{Unit rate} = \frac{200}{12} \approx 16.67 \text{ per month} \]

Now, we can compare the unit rates:

  • Monthly option: $20 per month
  • Yearly option: approximately $16.67 per month

Since $16.67 is less than $20, the yearly option at $200 is the better deal.