The additional usage will be calculated and charged based on the hourly rate that you have set for the scalability option. Your single monthly subscription license usage is counted as 750 hours in total and additional usage on top of 750 hours will be counted and charged every month in addition to your monthly subscription fee.
Some of the examples are given below to provide clear explanations
Example 1: 2 additional servers to your single monthly subscription are spun off for 30 hours. At your renewal date, you will pay Monthly Subscription Fee, plus a 30 x hourly fee ($0.24) as a renewal fee.
Example 2: 3 additional servers to your monthly subscription are spun off for 1020 hours. At your renewal date, you will pay Monthly Subscription Fee, plus a 1000 x hourly fee ($0.24) + 20 x hourly fee ($0.19) as a renewal fee.
Example 3: 8 additional servers to your monthly subscription are spun off for 5550 hours. At your renewal date, you will pay Monthly Subscription Fee, plus a 1000 x hourly fee ($0.24) + 4000 x hourly fee ($0.19) + 550 x hourly fee ($0.15) s a renewal fee