This is the total value of the coins in cents
To convert this to dollars, divide by 100. So the total value in dollars is (10d+5n+p)/100.
The three terms are
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Let's look at an example with actual numbers.
I picked three whole numbers at random.
So,
The total value is 10d+5n+p = 90+15+5 = 110 cents aka 110/100 = 1.10 dollars.