Her salary before the raise is $2000
Yearly income = $24,960
Monthly income = Yearly income / 12 months
= $24,960/12
= $2,080
Let
x = salary before the raise
$2,080 = x + 4% of x
2080 = x + (4/100 × x)
2080 = x + 0.04 × x
2080 = x + 0.04x
2080 = 1.04x
x = 2080/1.04
= 2000
x = $2000
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