A. Prakash menambah satu daripada harga sebanyak dua kali.

B. Prakash terlupa untuk menambah satu daripada tiga harga.

C. Prakash menolak satu daripada harga yang sepatutnya ditambah.

D. Prakash tertinggal digit terakhir bagi salah satu harga.

Given the analysis:

- The correct sum of the three items should be RM477, but Prakash got RM342.

Let's examine the potential mistakes one by one:

**A. Prakash menambah satu daripada harga sebanyak dua kali (Prakash added one of the prices twice).**
   - If Prakash added any of the prices twice, the sum would exceed RM477, not decrease to RM342. This doesn't seem to match the error.

**B. Prakash terlupa untuk menambah satu daripada tiga harga (Prakash forgot to add one of the three prices).**
   - If Prakash forgot to add one of the prices, the sum would be lower. For example:
     - If he forgot RM279: \( 49 + 149 = 198 \) (too low)
     - If he forgot RM149: \( 49 + 279 = 328 \) (close but still wrong)
     - If he forgot RM49: \( 149 + 279 = 428 \) (too high)
   - This option seems possible but doesn't exactly match the error to result in 342.

**C. Prakash menolak satu daripada harga yang sepatutnya ditambah (Prakash subtracted one of the prices instead of adding).**
   - If he mistakenly subtracted instead of adding:
     - \( 49 + 149 - 279 = -81 \) (which doesn't work)
     - \( 49 - 149 + 279 = 179 \) (which doesn't work)
     - \( -49 + 149 + 279 = 379 \) (which also doesn't match)
   - This doesn't seem to lead to the result of 342.

**D. Prakash tertinggal digit terakhir bagi salah satu harga (Prakash missed the last digit of one of the prices).**
   - If Prakash missed a digit:
     - If RM279 was entered as RM27: \( 49 + 149 + 27 = 225 \) (too low)
     - If RM149 was entered as RM14: \( 49 + 14 + 279 = 342 \) (this matches exactly!)
     - If RM49 was entered as RM4: \( 4 + 149 + 279 = 432 \) (too high)
   - This scenario directly matches the error of 342.

**Conclusion:** The correct answer is **D. Prakash tertinggal digit terakhir bagi salah satu harga (Prakash missed the last digit of one of the prices)**, specifically the RM149, which he might have entered as RM14, leading to the incorrect total of RM342.

Would you like any further details or explanations?

**Related questions:**
1. How could Prakash have detected this error before finalizing the calculation?
2. What other common errors might occur when entering numbers manually?
3. How can using a calculator history function help prevent such mistakes?
4. What steps could be taken to double-check important financial calculations?
5. How would the error affect a customer's receipt or billing?

**Tip:** Double-checking digit accuracy is crucial when entering numbers, especially in financial transactions.

Explore Prakash's calculation errors where he aimed for RM477 but got RM342 instead. Understand potential mistakes including adding a price twice, forgetting to add one price, subtracting instead of adding, and missing the last digit of a price.

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