Step-by-step explanation:
a) Lawrence has to pay 20% of the health insurance premium because his employer is paying for 80%.
b) To calculate the annual cost of Lawrence's portion of the health insurance premium, we multiply the total premium cost by the percentage he has to pay:
20% of $13,000 = 0.20 * $13,000 = $2,600.
Therefore, Lawrence's annual cost for his portion of the health insurance premium is $2,600.
