After the first month you get 10/100 * $300 = $<<10/100*300=30>>30 interest.
After the first month you will have $300 + $30 = $<<300+30=330>>330 in total.
After the second month you get = 10/100 * $330 = $<<10/100*330=33>>33 interest.
After the second month you will have $330 + $33 = $<<330+33=363>>363 in total.
#### 363