Huifen had 0.4 of his pens left aftet selling 816 of them at $0.40 each. He sold 0.75 of the remainder at $0.25 each. How much did he get from the sale of his pens?

Answer 1

Huifen had 816/0.4 = <<816/0.4=2040>>2040 pens to start with.
He had 2040 - 816 = <<2040-816=1224>>1224 pens left after selling some of them.
He sold 1224 x 0.75 = <<1224*0.75=918>>918 pens.
Therefore, he earned $918 x 0.25 = $<<918*0.25=229.5>>229.5 from the sale of his pens. Answer: \boxed{229.5}.