bc not found error when running Mysql tuning primer script

To fine tuning mysql server, run Mysql tuning primer script on server.

But I got error which said bc is not found. So just enter following yum install bc to install it.

[root@vps test]# ./tuning-primer.sh
which: no bc in (/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin)
Error: Command line calculator 'bc' not found!
[root@vps test]# yum install bc