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 the correct choice from the following answers.
A) 2/20
B) 3/20
C) 4/20
D) 5/20
E) None
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 3/20
<result>B</result>
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?