Anas needs a calculator for $100mn*0.1, based on the justification that "I was allowed to use the calculator when being interviewed for (a low-tier financial institution) , and got upset when being caught. Never ever imagined that 1) a claimed Stanford STEM graduate will need a calculator for 100*0.1 2) a claimed Stanford graduate would interview for a low-tier firm and bragged about it (is job market this difficult now? Even Goldman allows you to use calculator, that does not apply to consulting firms) 3) a "pro" on PrepLounge don't even know how to structure a case, and got upset immediately in the mock simply because he could NOT do the maths, and ran away. Wasting the precious time of his partner.