your quarterly, semi-annual, annual, and biennial prices into the equivalent monthly price. For example, a product with an annual price of $240 would be divided by 12 months and the price displayed as $20/month.

Because When Pay biennial How much Monthly they can compare monthly biennial
$8.00 per month
$4.08 per month (billed $49.00 for 12 months)
$4.08/mo (billed $147.00 for 36 months)