Forex chapter query

VISHVESH SHUKLA (NA) (273 Points)

23 October 2013  
importer requested remitt 5000 SGD. market rate are as follows 1$=rs. 45.85/45.90 1=$1.7840/1.7850 1=SGD 3.1575/3.1590... i want to learn how the rate will apply from bank point of view. if possible then plz explain clearly in detail