Well, you actually do have an adjusting entry involved -- they just aren't calling it that. Just like many texts have you do the entry to expense used up supplies, which is also an adjusting entry and they don't call it that. Then Ch. 3 (yes, it's usually 3) goes into more detail about adjusting entries.
The purpose of the 10 coupons is that you have to know the dollar worth of them. $75 per book of coupons and there's 10 coupons in each. i.e. $7.50 per coupon.
Think about what unearned revenue is. It's something that has been paid in advance to the company, but the company has not earned it yet. Hence, it's a liability account because they have an obligation -- in this case to allow people into the park. At the end of June, they have redeemed 80 coupons and therefore have earned 80 coupons worth of income. So it's no longer "unearned" and no longer a liability. So it has to come out of the unearned account and then credited to the earnings account, I assume Admissions Revenue.
That's a little odd to do something like that before getting to adjusting entries, but there it is. And now you have a jump-start on Ch. 3.
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