Let say I was an Iron Coin bazillionaire and wanted to buy every level of every relic...

What's the cost in iron coins there? to reach level 10 for every relic in the store?

Is there a total cost to reach level 10 of a single relic?

Is the total cost to hit level 10 the same for all relics or do they vary?

Is there a total cost to reach level 10 of a ALL relics for a single class?

Is the total cost to reach level 10 of all relics in a class the same across classes?