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Answer:
Step-by-step explanation:
"To the next ten" means we will turn 42 into 50 and 59 into 60.
Since we are adding 8 to 42 and 1 to 60 this will not be exactly right, hence why it is an overestimate.
If, 5 * 6 = 30
Then, 50 * 60 = 3,000