Aquantity decreases from 125 to 85. what is the percentage decrease?

32% decrease

Step-by-step explanation:

decrease = (original number - new number) / (original number) * 100

               = ((125 - 85) / 125) * 100

               = (40 / 125) * 100

               = 0.32 * 100

               = 32% decrease <===

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