The cost of a chair is $x,is $70 correct to the nearest $10
The cost of a desk is $y,is $900 correct to the nearest $50
a)find the lower bound and upper bound of x and y
b)find the lower bound of the total cost a desk and four chair, show ur working
Plz help @Mathematics

Question

The cost of a chair is $x,is $70 correct to the nearest $10
The cost of a desk is $y,is $900 correct to the nearest $50
a)find the lower bound and upper bound of x and y
b)find the lower bound of the total cost a desk and four chair, show ur working
Plz help  @Mathematics

coolcat · Answer

lower bound of x: $65
upper bound of x: $75

i think b is:

L.B: $850
U.B: $950.


:D

anonymous · Answer

I said x AND y
also there are no steps shown so i do not understand how this has been done

coolcat · Answer

whenever u find a lower bound of something reduce it so the last number ends in5. make sure it is LESS than the original amount. when u find the upper bound of something increase it by the asked (nearest to whatever...) and make sure that ends in 5 too.

and im certain about x but not sure about y.