To solve this problem, let's break it down step by step:

1. Divide 40 by half: When we divide by half, it is equivalent to multiplying by 2. So, dividing 40 by half is the same as multiplying 40 by 2, which gives us 80.

2. Add ten: Adding ten to 80 gives us 90.

Therefore, the correct answer is option D) 90.

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