I have no idea what percentage of my income goes on bills, but even if I did, it wouldn't help with your problem about being short if you're furloughed.
Have you managed not to be furloughed up to now, and do you know if you'll be reduced to 80%, some employers have being paying 100%, and don't forget, if you have annual leave to use, and use some of that in the furlough period, you will be paid 100% for this. It might also be the case that your expenses will reduce when you're not going to work, if you use less petrol and normally buy your lunch for example?
However, if being furloughed is a concern and you haven't done it before, now is the time to take a good hard look at your budget and cut out any unnecessary spending to increase your surplus if possible - if you are furloughed, it's an excellent use of your time, even if you think you have already made all the savings you can.
Have a look at:
www.moneysavingexpert.com/family/money-help/
There's also sections on MSE about help with COVID and what your rights are, and sign up to the weekly email for ongoing tips on making the most of your money.
Good luck!