Start with a unlock code of 100. For each of the following statements that is true, add 10 TIMES its statement number to the unlock code. Enter your final number to unlock the door

1. 1/2 + 3/4=3/4

2. 5/8 - 1/4 = 3/8

3. 4/5 + 7/10 = 1 1/2

4. 2 1/2 - 1 5/6 =1/6