Mint

mint a new headphone out of 2 existing headphones from your collection

H1, H2 = headphone1, headphone2

MC = mint count [0, 2] step length = 1

R = rarity [1, 7] step length = 1

HUT: R(H1) x75 + MC(H1) x50 + R(H2) x75 + MC(H2) x50

HBK: R(H1) x15 + MC(H1) x10 + R(H2) x15 + MC(H2) x10