Answer:
$67.1 million
Explanation:
Given that,
Projected benefit obligation at the beginning of 2021 = $51 million
Service cost = $18 million
Retiree benefits = $7 million
Projected benefit obligation at December 31, 2021:
= Beginning of 2021 + Service cost + Interest cost - Retiree benefits
= $51 million + $18 million + (10% × $51 million) - $7 million
= $51 million + $18 million + $5.1 million - $7 million
= $67.1 million