Software Testing output type question

Q.  A shopping website gives discount based on prices of total purchased items. Suppose customer purchases are below 2000 Rs. then no discount,for purchases till 20000, it gives 10% discount and above 20000 it gives 15% discount. Which of the following sets of values lie in 3 different equivalence classes?
- Published on 03 Aug 15

a. 1800,2000,8000
b. 2001,10000,20002
c. 1800, 2003,58000
d. 100,1800,20001

ANSWER: 1800, 2003,58000

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