Jell and Dell were partners with capital balances of $600 and $800 and an income sharing ratio of 2:

Jell and Dell were partners with capital balances of $600 and $800 and an income sharing ratio of 2:3. They admitted Zell to a 30% interest in the partnership, and the total amount of goodwill credited to the original partners was $700. What amount did Zell contribute to the business?Ans: 900But how to find the answer?