After my salary was increased by $16\%,$ it was $\$55{,}680$. What was my salary before the increase?

The salary before the increase was $48000.

Step-by-step explanation:

Let us assume,

The previous salary before the increase be 'x'.

It is given that,

After increased by 16%, the salary turned to $55680.

Therefore, take the previous salary x as 100%. The increase of 16% from x will be 116%.

So, 116% of x equals to the increased salary $55680.

To find the value of x :

⇒ (116/100) × x = 55680

⇒ (1.16) × x = 55680

⇒ x = 55680 / 1.16

⇒ x = 48000

∴ The salary before the increase was $48000.

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step-by-step explanation:

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this