[Bug] Math calculation error in pricing model analysis

Question

**Bug Description**
The math calculation is wrong on the basic tier pricing model I'm discussing - Claude says a $15 annual savings on a $7/month  product is 1.8 months savings.  And then tells me that in order to reach 2 months savings I have to set the price at 70

**Environment Info**
- Platform: darwin
- Terminal: Apple_Terminal
- Version: 2.1.193
- Feedback ID: e9aaa02f-89d7-4663-b0a2-dacf0bea15de

**Errors**
```json
[]
```