(a) Upon retirement for service following reinstatement, the member shall receive a service retirement allowance equal to the sum of both of the following:

1. (1) An amount equal to the monthly allowance the member was eligible to receive immediately preceding the most recent reinstatement, exclusive of any amounts payable pursuant to Section 22714 or 22715, increased by the improvement factor that would have been applied to the allowance if the member had not reinstated.
2. (2) An amount calculated pursuant to Section 24202, 24202.5, 24202.6, 24203, 24203.5, or 24206 based on credited service accrued, including any service granted pursuant to Section 22717 or 22717.5, subsequent to the most recent reinstatement, the member’s age on the last day of the month in which the retirement allowance begins to accrue, and final compensation.

(c) If the total amount of credited service accrued, other than that accrued pursuant to Sections 22714, 22715, 22717, 22717.5, and 22826, except as provided in subdivision (c) of Section 22121, is equal to or greater than 30 years, upon retirement for service following reinstatement, a member who retired pursuant to Section 24213, and received the terminated disability allowance for the prior retirement, shall receive a service retirement allowance equal to the sum of the following:

1. (1) An amount based on the credited service accrued, including any service granted pursuant to Section 22717 or 22717.5, prior to the effective date of the disability allowance, the member’s age at the prior retirement increased by the factor provided in Section 24203.5, and projected final compensation.
2. (2) An amount calculated pursuant to Section 24202, 24202.5, 24202.6, 24203.5, or 24206 based on credited service accrued, including any service granted pursuant to Section 22717 or 22717.5, subsequent to the reinstatement, the member’s age on the last day of the month in which the retirement allowance begins to accrue, and final compensation using compensation earnable, or projected final compensation, or a combination of both.