ANSWER
The required angle is

EXPLANATION
Let the angle whose sine is

be

Then

We take the inverse sign of both sides to obtain,

We use our scientific calculator to evaluate and obtain,
$12 each. $75 - $39 = $36. $36 divided by 3 = $12. Assuming he used all his money.
Millions. Btw if there's 2 commas and 1 digit before the first comma it's million
If you are using a calculator, simply enter 78÷260×100 which will give you 30 as the answer.