I'm mathematically impaired/ignorant and trying to figure out the difference in earnings between my partner and I to work out a fair split of the bills.
So; I earn £2060 per month and partner earns £1650. As a percentage, how much more than her do I earn?
Therefore; If we had a mortgage payment of £850, by what percentage should we split the figure by so it’s proportionate to the difference in our earnings.
Any help sincerely appreciated,
M.
Your combined earnings are $2060+1650$. So if you will split the rent in proportion to your earnings, you should pay $$850\times \frac{2060}{2060+1650}$$ and your partner should pay $$850\times \frac{1650}{2060+1650}.$$ The amounts are (to $2$ decimal places) $471.97$ and $378.03$ respectively.
As to your question about percentage, you earn $$\frac{2060-1650}{1650}\times 100\%,$$ that is, about $24.85\%$ more than your partner. I believe that this gives a less clear path to seeing what your rent contributions should be.
Remark: There is a good argument that the contributions should be proportional to after tax income rather than income. That argument may not please your partner.