Relative error when chopping is used of a 32 bit floating point number in IEEE 754 format

Question

Find the binary representation of 85.125 using IEEE 754 standard 32-bit floating point number presentation. Find the relative error if chopping is used.

I calculated the binary representation of 85.125 using IEEE 754 standard 32-bit, which is:

0 10000101 01010100100000000000000

Now how to calculate the relative error if chopping is used?