Ex. 7 B dau corona am pus foto
![Ex 7 B Dau Corona Am Pus Foto class=](https://ro-static.z-dn.net/files/d65/e5c6b970bb88950f06ad8007a0f53a19.jpg)
b) 1 / 12 * 12 = 12 / 12 = 1%
4 / 7 * 7 = 28 / 7 = 4%