Proportions - if 1 subscription costs $21, how much is 28 subscriptions?

1 subscription = $21

28 subscriptions = x

You know 1 subscription is $21

You want to find out how much 28 subscriptions are

Multiply 28 (subscriptions) by 21 ($ per subscription)

28 x 21 = 588

28 subscriptions cost $588

If you would like the formula to find out how many subscriptions cost hat amount of money,

21x = y

x is how many subscriptions you want, while y is the total cost of the money