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.

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b

you already gave the answer

step-by-step explanation: