5:2:31:5:5—5:10:15⇒1:2:3 Now, CP of rasgulla =120×43​=Rs 90∴ Ratio of amounts invested in a kg of rasgulla will be 15:30:45 But clearly we can see from the quantity ratio, Sugar weight in a kg of Rasgulla =105​=21​kgSo, 21​kg price of sugar = Rs 15 ⇒ 1 kg price of sugar = Rs 30