Solve Addition Problem: 11,710 + 30,120

Let's begin by adding the numbers $11,710$ and $30,120$:

Align the numbers by place value:

• $11,710$
• $+30,120$

Proceed to add each pair of digits starting from the rightmost side:

• Units: $0 + 0 = 0$
• Tens: $1 + 2 = 3$
• Hundreds: $7 + 1 = 8$
• Thousands: $1 + 0 = 1$
• Ten-thousands: $1 + 3 = 4$

Put them together and we get:

The sum is $47,830$.

The correct choice that matches this sum is:

• Choice 1: $47,830$

Therefore, the solution to the problem is $47,830$.