If you spend 1/4 of your salary during the first week of the month and 20% of it during each of the coming 3 weeks, what part(fraction) of your salary will leave unspent at the end of the month?
Choose one.
A) 2 / 20  B) 3 / 20  C) 4 / 20  D) 5 / 20  E) none

Rationale: solution : 1 / 4 + 3 ( 20 / 100 ) = 1 / 4 + 3 / 5 = 5 + 12 / 20 = 17 / 20 the sallary that will be spent = 17 / 20 unspend will be = 1 − 17 / 20 = 20 − 17 / 20 = 3 / 20 answer b
Answer: B