Canto 1 - Boyhood
Bāla-kāṇḍa
Chapter 14: The Aśvamedha Sacrifice
Text 1.14.51
दश कोटीः सुवर्णस्य रजतस्य चतुर्गुणम्॥
daśa koṭīḥ suvarṇasya rajatasya catur-guṇam
daśa koṭīḥ = 100,000,000; suvarṇasya = gold coins; rajatasya = and silver coins; catur-guṇam = four times more than that.
[He also gave them] 100,000,000 gold coins and silver coins four times more than that.
[31] tasmād dhi rajatam adakṣiṇyam.
King Daśaratha gave an equivalent of 400,000,000 silver coins. He didn’t give silver as such a dakṣiṇā on that occasion would be in opposition to a Śruti injunction that one should not give silver in dakṣiṇā [on that occasion] [31].