Kritika is on a 4 days trip with school mates. She had decided to keep her average expense for 4 days at Rs 80. However, at the end of the third day, she realized that her expenses on the first three days were Rs 80, Rs 90, Rs 110 and respectively. How much should she spend on 4th day to ensure that she meets her targeted average expense?
Options
40
60
90
220
Answers
Answer:
a) 40
Step-by-step explanation:
total expense for 4days=₹80*4=₹320
total expense for 3days=₹(80+90+110)=₹280
expense for forth day=₹(320-280)=₹40
GIVEN :
Kritika is on a 4 day trip with school mates.
She had decided to keep her average expense for 4 days at Rs. 80
She spend in her three days Rs. 80, 90 and 110 respectively.
TO FIND :
What amount should she spend on her 4th day to ensure that she meets her target average expenses.
SOLUTION :
She has spent amount in three days = 80 + 90 + 110
= 280 Rs.
She had decided to spend the average amount = 80 Rs./day
She decided to spend total amount in her 4 day trip = 80 × 4
= 320 Rs.
Now she should spend on 4th day = 320 - 280
= 40 Rs.
She should spend 40 Rs. on 4th day to meet her targeted average expense.
Option A. 40 Rs.