Need help,don't get this:(

Question

Gabe has an employer-sponsored 401(k) plan that he contributes to, and his employer matches 25% of his 401(k) contributions. Gabe's salary is $30,000, and last year he contributed $4000 to his 401(k) plan. What was the total amount that was contributed to his 401(k) last year?
A. $1000
B. $4000
C. $5000
D. $6000

Answer 1

  $4000       -    "he contributed $4000"

+$1000       -    "his employer matches 25% of his 401(k) contributions"

                       25% of $4000 is $1000

 --------

  $5000       -  "total amount that was contributed to his 401(k) last year"