=SI($A1>2800;"2x "&INDEX($K$1:$K$15;EQUIV($A1/2;$J$1:$J$15;1));INDEX($K$1:$K$15;EQUIV($A1;$J$1:$J$15;1)))
=SI($A1>2800;2*INDEX($K$1:$K$15;EQUIV($A1/2;$J$1:$J$15;1));INDEX($K$1:$K$15;EQUIV($A1;$J$1:$J$15;1)))
=SI($A1>2800;ARRONDI.SUP($A1/2801;0)*INDEX($K$1:$K$15;EQUIV($A1/2;$J$1:$J$15;1));INDEX($K$1:$K$15;EQUIV($A1;$J$1:$J$15;1)))