# Saving in January

On the 1st of January a students puts $10 in a box. On the 2nd she puts $20 in the box, and so on, putting the same number of 10-dollers notes as the day of the month. How much money will be in the box if she keeps doing this for

a the first 10 days of January

b the whole of January?

a the first 10 days of January

b the whole of January?

### Correct answer:

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