It's usually en estimate or theres a range between the cheapest price you can get something and the most expensive. You are guaranteed 1 fortune coin every time you use a dew drop and any additional is random. It's hard to calculate the probability of getting fortune coins so its not a fixed price.

ex the usual one ok. 3 fortune coins for cave key, so 1 cave key worth of 13 cps then 3 fortune coins is 13 cps . when clothing aroudn25 so u just substarct with 3 then its left 8 x 13 = 104 cps. that how to calculate bassi on coins . But if basis from cps that u use it realy expensive all of them.

^That's not how you do this.

Disclaimer: this is rng event, so for the simplicity of math im asuming every item on the tree has exactly the same drop chance (which isnt true, later on frags have a lot smaller occurance than coins, but that actually benefits our scenario). Not counting free dews.

In every level you have X coins as rewards, while Y is all the rewards in total (X= sum of coins, so for lvl1 X=2coins + 3coins=5coins). You also gain 1 coin per every dew use.

Every tree level has different ammount of dew you need to use to level it up. Lets call that number Z. Lv1=Z1=20, Lv2=Z2=50, Lv3=Z3=100...

1dew costs 20cp, while 10 cost 190cp, so im taking 190/10=19 as average dew cost.

Now to calculating values of each level alone. Formula, number near letter corresponds to tree level + example. Further lvls are same, only variables change:

1) average coin per draw: X/Y +1(which is free coin we get after draw) | lv1: 3/4 +1 =0,75+1=1,75

2) average coins on that level: (average coin per draw)*Z | lv1: 1,75*20=35

3) that level cost: Z1*19 | lv1: 20*19cp=380cp

4) Average cost of 1 coin on that level: (level cost)/(average coins on that level) | lv1: 380/35= 10,86 coupons per coin

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Thats how you calculate a certain level cost. However due to scaling nature of that event (each level you get more coins on average, ergo lower levels are more expensive than higherlevels) you need to consider that as well.

Because of that, average number of coins and their cost change. Because of maintenance I dont have access to tree images, co cant calculate it now (and wont, if you are interested do it yourself- its elementary school math).

For lv2 process is as follows:

1-4) same math as above.

5) full cost so far: cost of previous levels + current level | Lv1+Lv2= 20*19+50*19= 380+950= 1330

6) average coins so far: weighted average ((average coin on previous level)*(ammount of dew for previous lvl = Z1) + (average coin on current level)*(ammount of dew for current level=Z2) / (sum of dews so far=Z1+Z2)

7) Average cost of coin so far: sum of level cost divided by (average coins so far)

***

For higher levels its exactly the same, though you need to add another part to 6).

Steps 1-4 are only about current level coin prices, not total coin prices. All steps for each new level have to be recalculated.

***

Given those informations, you can count anything you need

Thankss alotss bro for sharing this info with me.. I really appreciate this :)

there's an easy way to do a very rough calculation.

look at how much cost things you know the price for sure and you have the reply.

cave key costs with no discounts 13 coupons each one.

advanced cloths costs with no discounts cost 63 coupons each one.

So we can consider that 5 keys cost 15 fortune coins, 1 advanced cloth costs 12 coins.

Means 1 coin = 5/6 coupons