Tally 9- minor issue !

When I open the multi currency ledger Cash a/c and press f12-show only forex !
The forex amount, doesnt match with the primary amount.

For example...My primary currency should be 100rupees, for 1usd (secondary currency).

SO its showing 5000rupees for 1usd ... when i press f12 and click show forex only...the usd is ok, but the rupees is too high !

Its not going as per the prevailing exchange rate...

did you guy get me ? or should i show you some screenshots ?

guys plz help me out !