The table is
\\
\
First Number x \ | \
\
Second Number \ | \
\
Product P \ | \
\
10 \ | \
\
| \
\
| \
\
20 \ | \
\
| \
\
| \
\
\
\
\
First Number x \ | \
\
Second Number \ | \
\
Product P \ | \
\
10 \ | \
\
| \
\
| \
\
20 \ | \
\
| \
\
| \
\
30 \ | \
\
| \
\
| \
\
40 \ | \
\
| \
\
| \
\
50 \ | \
\
| \
\
| \
\
60 \ | \
\
| \
\
| \
\
70 \ | \
\
| \
\
| \
\
80 \ | \
\
| \
\
| \
\
90 \ | \
\
| \
\
| \
\
100 \ | \
\
| \
\
| \
The maximum is attained near x = 50 and 60.