Those will be lovely! I've used a lot of supersaver yarn in the past and expect I will in the future. Nothing I've ever used holds up to abuse and washing like this stuff does so it's really good for blankets that will be used and abused by kids spilling stuff on them or in other ways. When I'm in desperate need of a yarn fix I head to WalMart and look at RHSS. When you're hooked, you're hooked.
I should never overestimate my basic arithmetic skills.