pre_text: Operating Revenue Notes: (1) Includes revenues from subscription (prepaid/postpaid), interconnect, outbound and inbound roaming, wholesale revenue from MVNOs (Mobile Virtual Network Operators) and mobile content services such as music and video. (2) Includes equipment sales related to ICT services. (3) Mainly from provisions of digital marketing and advertising services and regional premium OTT video. (4) Includes energy reselling fees. As at 31 March 2019, the transaction price attributable to unsatisfied performance obligations for ICT services rendered by NCS Pte. Ltd. is approximately S$3 billion which will be recognised as operating revenue mostly over the next 5 years.
  As at 31 March 2019, the transaction price attributable to unsatisfied performance obligations for ICT services rendered by NCS Pte. Ltd. is approximately S$3 billion which will be recognised as operating revenue mostly over the next 5 years. Service contracts with consumers typically range from a month to 2 years, and contracts with enterprises typically range from 1 to 3 years.
table: Group
table: 2019 2018
table: S$ Mil S$ Mil
table: Mobile service (1) 5,395.7 5,737.3
table: Sale of equipment 2,876.7 2,414.5
table: Handset operating lease income 140.5 25.2
table: Mobile 8,412.9 8,177.0
table: Data and Internet 3,340.9 3,435.7
table: Business solutions 604.1 560.7
table: Cyber security 548.7 527.1
table: Other managed services 1,880.8 1,920.0
table: Infocomm Technology (“ICT”) (2) 3,033.6 3,007.8
table: Digital businesses (3) 1,245.3 1,113.1
table: Fixed voice 899.0 1,084.3
table: Pay television 372.7 369.4
table: Others (4) 67.3 80.7
table: Operating revenue 17,371.7 17,268.0
table: Operating revenue 17,371.7 17,268.0
table: Other income 224.7 258.8
table: Interest and investment income (see Note 10) 38.1 45.5
table: Total 17,634.5 17,572.3
question: Analyse this data from a financial earnings document. What is the average revenue under "Other income" across the 2 years?