Matrices and Relations

A,B and C are matrices of 30*40, 40*50 and 50*20 respectively. If the product ABC is calculated as A(BC), find the number of multiplications required; and the number of additions required.
Consider BC, the size is 40*20. Total 800 elements
each element is calculated by using 50 multiplications and 49 additions
Consider A(BC), the size is 30*20. Total 600 elements
each element is calculated by using 40 multiplications and 39 additions
The number of multiplications required is
800*50+600*40=64000
The number of additions required is
800*49+600*39=62600