Answer
120 pounds
Work Step by Step
Start with 100 pounds. Populate the table in increments of 10 pounds to narrow down the solution before computing in 1 pound intervals if necessary.
$\ \ \underline p\ \ \ \ \ \ \underline{25+0.25p}$
$100\ \ \ \ \ \ \ \ \ \ 50$
$110\ \ \ \ \ \ \ \ \ \ 52.5$
$120\ \ \ \ \ \ \ \ \ \ 55$
120 pounds is the correct answer.