Answer:
We need to add to the $3.00 we have at the start, what they gave him:
He started with $3.00 and received $10.00:
3.00 + 10.00 = <u>$13.00</u>
<u />
Then (when having $13.00) received $30.00:
13.00 + 30.00 = <u>$43.00</u>
<u />
Then (when having $43.00) received $100.00:
43.00 + 100.00 = <u>$143.00</u>
<u />
Then (when having $143.00) he had another $7.00:
143.00 + 7.00 = $150.00
