Help! Each week, Christian earns $x fixing bicycles and receives $10 as his allowance.
To find how much he will earn in total over 2 weeks, Christian calculates : x + 10 + x + 10
What is another way Christian can calculate how much he will earn in total over the 2 weeks?
A: x + 10
B: 2x +10
C: x +20
D: 2(x + 10)