Please solve by expert and make quick as soon as possible

3. A corn farm can be harvested once every month. In a month, up to 2,500 corns can be harvested in which it can be sold at RM 0.40 per corn. If the harvest is delayed up to two months, the cost price will go down as low as RM 0.10 per corn but the crop will increased by extra 2,400 corns per month. In addition, the amount of spoilage is approximated to be 200 corns per month for each month he delays harvesting. Estimate the time he should harvest his crop to achieve the maximum net cash return and the amount of the crop he will received at that time. [Sebuah ladang jagung boleh dituai sebulan sekali. Dalam sebulan, sehingga 2,500 jagung boleh dituai di mana ia boleh dijual pada harga RM 0.40 sebiji. Jika penuaian ditangguhkan sehingga dua bulan, harga kos akan turun serendah RM 0.10 setiap jagung tetapi tanaman akan meningkat sebanyak 2,400 jagung tambahan sebulan. Di samping itu, jumlah kerosakan dianggarkan sebanyak 200 jagung sebulan untuk setiap bulan penangguhan penuaian. Anggarkan masa pekebun harus menuai hasil tanamannya untuk mencapai pulangan tunai bersih maksimum dan jumlah tanaman yang akan diterimanya pada masa itu.]