Hana sold 4/7 of her stamp collection for $28. How much would she have earned from selling the entire collection?
Hana sold 4/7 of her collection for $28, so 1/7 of her collection represents: 28/4 = $<<28/4=7>>7.
And as a result, the entire collection represents: 7 * 7 = $<<7*7=49>>49.
#### 49