Assuming an equip has 7 slots to scroll.

An Equip cost 375 each.

30% Scroll costs 8.5 each: 30% success rate and 50% destroy rate if it failed.

Protect scroll costs 400 each: the equip slot won't decrease if 30% Scroll failed. However, it still has a 50% destroy rate if it failed.

How much would it cost to pass the 1st slot using 30% Scroll with Protect Scroll?

How much would ti cost to pass all 7 slots using 30% Scroll with Protect Scroll?

Please give the formula as well.