exam Maths Puzzle Numerical Ability

Last month a factory produced 800 television sets. This month, The same factory produced 1,064 television sets. The increase in production from last month to this month is?

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exam Other Question

the sum of two numbers is 28,and there product is 7.find the sum of the reciprocals of the numbers. (1,1)
A=(0,2) find a matrix B such that C(A)=N(B)
(1,0)

i get that c(a) means column space and n(b) is a null space, but no idea how to d