Darius had some fruits at his stall. 3/8 of them were avocados, 3/4 of the remainder were cantaloupes and the rest were citrus . The amounts earned for each avocado, each cantaloupe and each citrus sold are $1.70, $1.10 and $1.80 respectively. The number of avocados sold to the number of cantaloupe sold to the number of citrus sold was 3 : 2 : 1. In total, he sold 1/16 of the fruits and earned $63.70. How many citrus did he have at first?