The balance before the loss was $3,100.
Let the balance before the loss be x.
x - 10% of x = $ 2,790
x - 0.1x = $ 2,790
0.9x = $ 2,790
x = $3,100
In mathematics, a percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, "%", although the abbreviations "pct.", "pct" and sometimes "pc" is also used. A percentage is a dimensionless number; it has no unit of measurement.
Learn more about percentages here https://brainly.com/question/843074
#SPJ2
