Source https://www.citibank.com.sg/gcb/credit_cards/rewards-credit-card.htm?icid=SGRDAYEENCCCRCALM
3,600 points = $10
$180 spending = $10 (5.56%)
source (citirewards) : https://rewards.citirewards.com/v1/BrowseCategory.htm?category=statement-credit&cmp=nav&lid=sub-nav%7Ccash-rewards%7Ccash-rebate
Last update : 20th sept 2016