exam Maths Puzzle Numerical Ability

Please help!
The product of:
2 1
-3 5

and
3 1 -1
2 4 -2
both in brackets, is what?
Thanx!

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exam Other Question

Bob owns a car wash and pays his employees either $5 plus 2% commission or $3 plus 4% commission. How much would sales have to be for the pay to be equal?

I got:
y= 5+.02x
y= 3+.04x

Not sure what x=?

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