Source: Extra Practice

A shopkeeper earned Rs. 250 on Monday. On Tuesday, he spent Rs. 120. On Wednesday, he earned double the amount he spent on Tuesday. What is his net earning over these three days? Express this as an arithmetic expression and find its value.

Options

Option A is correct

Rs. 370

Option B

Rs. 290

Option C

Rs. 250

Option D

Rs. 320

Explanation

Let's break down the earnings and expenses:

  • Monday's earning: Rs. 250
  • Tuesday's spending: Rs. 120 (This is a negative earning or expense)
  • Wednesday's earning: Double the amount spent on Tuesday, which is 2×120=2402 \times 120 = 240 Rs. The arithmetic expression for the net earning is: 250−120+2×120250 - 120 + 2 \times 120 Now, apply the order of operations (BODMAS/PEMDAS):
  1. Perform Multiplication: 2×120=2402 \times 120 = 240 The expression becomes: 250−120+240250 - 120 + 240
  2. Perform Subtraction and Addition from left to right: 250−120=130250 - 120 = 130 130+240=370130 + 240 = 370 Therefore, the net earning over these three days is Rs. 370. The other options are incorrect, likely due to errors in forming the expression or in the calculation steps.