Consulting Case Interview Practice Questions

Answer: $2.94. To find 5% of a number, first find 10%, then halve it. In this case, 10% of $2.80 is $0.28. Half of that is $0.14. Add the 14 cents to $2.80 to get $2.94.

Key Takeaway: Logical reasoning is critical with percent problems. Knowing how to manipulate numbers in relation to “friendly” numbers is important. For example, to find 5%, halve 10%. To find 20%, double 10%.