Payoff Table

State of Nature

$\backslash$table$[[$Decision Alternative,Good,Bad$],[$Buy $10$ units,$5\mathrm{.}0,-3\mathrm{.}0],[$Do nothing,$-3\mathrm{.}8,8\mathrm{.}1],[$Buy $20$ units,$7\mathrm{.}1,0],[$Sell $10$ units,$-5\mathrm{.}3,5\mathrm{.}2]]$

What is the Payoff of choosing to buy $10$ units in a state of nature of Bad?

Answer format: Number. Round to: $2$ decimal places.