Your answer is $60. how i got this by taking 3 and multiplyed it by $20 and that gave me $60. so we know 60 + 50=110 so it's the same as $60 + $50=$110. also you could put it in a equation which is $50 + $3(x)=$110. to solve that you would just find out what can fit in the X place which was $20.
if a sequence is bounded both above and bounded below then we say its bounded. we can only conclude that 3.115 is either upper bound or the lower bound.
