The purchased cost of a shell$-$and$-$tube heat exchanger

$($floating head and carbon$-$steel tubes$)$ with $100f{t}^2$ of heating

surface was $$3000$ in $2017.$ What will be the purchased cost of

a heat exchanger with $200f{t}^2$ of heating surface in $2020?($The

purchased$-$cost$-$capacity exponent is $0\mathrm{.}60,$ and cost indexes are

$560(2017)$ and $890(2020)).$