Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: In the diagram, $QRS$ is a straight line. What is the measure of $\angle RPS,$ in degrees? [asy]
pair Q=(0,0);
pair R=(1.3,0);
pair SS=(2.3,0);
pair P=(.8,1);

draw(P--Q--R--SS--P--R);

label("$Q$",Q,S);
label("$R$",R,S);
label("$S$",SS,S);
label("$P$",P,N);

label("$48^\circ$",Q+(.12,.05),NE);
label("$67^\circ$",P-(.02,.15),S);
label("$38^\circ$",SS+(-.32,.05),NW);

[/asy]
user