A business bought r typewriters at $100 per typewriter and s calculators at $50 per calculator. What is the total cost of the typewriters and calculators?
I . The s calculators cost $200
II. 2r+s = 10
100R+50S = 50(2R+S)
FROM ONE ....INSUFF
EACH 2 TYPEWRITERS AND 1 CALCULATOR = 10
THUS 100R+50S = 500
b IS MY ANSWER
For the equation 100R + 50S, we will get the total cost.
The second equation is 2R + S = 10
Why are we assuming that this 10 is the cost and multiplying by 50 on both sides will get us the total cost? It could be the of the typewriters and calculators which makes choice B insufficient and C sufficient.