Number of students: $$(60+10)\div (70-60)=7$$  Price of boardgame: $$60\times7+60=480$$． 
Some students are buying a boardgame together. If each person pays $$$60$$, they need another $$$60$$ for payment. If each person pays $$$70$$, they will have $$$10$$ left. How much is the boardgame? 
a: $$$600$$ 
b: $$$480$$ 
c: $$$690$$ 
d: $$$550$$ 
e: $$$720$$ 