Price in currency doesn't mean a great deal in a country that is bankrupt.
The numbers don't seem right anyway. The actual price paid for a Mk I Spitfire in 1940 was £6033, which works out as around 75000RM.
AFAIK 1941 exchange rate pound:RM was near 1:80 (crossing with US $, obv. wasn't a exchange rate form pound and RM)