500. The number of assistants is four times of partners. Total number of people is 40. The contribution of partners is three times of assistants. Now the total contributions are $ 1680, asking for each partner’s contribution. (90)
There are 8 partners and 32 assistants. then 8 C(assistant)+32C(partner)=1680. C(p)=3C(s); C(s)=30, C(p)=90