With this method, the financial institution applies a combination of both C1 and C2 calculation methods depending on the tier. For example, method C1 may apply to the first two tiers and method C2 may apply to the third tier.

The interest calculation does not include Tier 1 at 1 percent because it uses the highest interest rate up to $5,000, which is 2 percent.
Therefore, with method C1/C2, if you have $5,200 in your account, 2 percent is applied to your balance from $0 to $5,000 and 3 percent is applied to your balance between $5,001 and $5,200.