Algebraic Word Translations

Hi All.

'Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persuaded n more people to donate $500 each to Mary's campaign' Denote a formula for the amount contributed to the campaign.

Translating this I would work as follows.

1. Mary persuaded n friends to dontate $500 each to her election campaign: [tex]500n[\MATH]

2. Each of these n friends persuaded n more people to donate $500 each to Mary's campaign[tex]500n(500n)[\MATH]

However the answer is [tex]$500(n^2 + n)[\MATH]

Where did I go wrong?

Thanks,

D