multiples

If 500 is the multiple of 100 that is closest to X and 400 is the multiple of 100 that is closest to Y, which multiple of 100 is closest to X +Y ?

1). X is less than 500

then x can be between 450 & 499

now y can be between 350 & 449

so x+y can be between 800 & 948 hence multiples possible are 800 ,900

INSUFF

2). Y is less than 400
y can be between 350 -399

x can be between 450 - 549

again x+y can have 800, 900 as closest multiples

combine:

x can be between 450 & 499
y can be between 350 -399

x+y is bewteen 800 & 898

again we have 800 & 900 as possibilitties

E