Grab a calculator - you won't be able to do this one in your head…]
1. Key in the first three digits of your 7-digit phone number (NOT the area code);
2. Multiply by 80;
3. Add 1;
4. Multiply by 250;
5. Add the last 4 digits of your phone number;
6. Add the last 4 digits of your phone number again;
7. Subtract 250;
8. Divide number by 2.
What is the number?