exam Maths Puzzle Numerical Ability

Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%?

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exam Other Question

Perform the indicated operations.
Let U = {a,b,c,d,e,f,g}, X = {a,c,e,g}, Y = {a,b,c} and Z = {b,c,d,e,f}

1. X'n Z

2. (X' U Y')UZ

3. (X n Y')n(Y n X') If the inventor in exercise 53 charges $4 per unit, then her
profit for producing and selling x units is given by the function

P(x)= 2.25x - 7000
(a) What is her profit if she