4 ms·
It's even easier if you consider that C/5 is 1/10 of 2C. So, just double C and then subtract 10% of the result.
by dminor 7y ago
It's even easier if you consider that C/5 is 1/10 of 2C. So, just double C and then subtract 10% of the result.
- mrep 7y agoKind of like how I calculate the tip: move the decimal place 1 over, double it and then round down.