How does a fixed exchange rate cures the problem of inflation and balance of payments in LCDs?

a brief knowledge of the terms used will help suffice the answer

How does a fixed exchange rate cures the problem of inflation and balance of payments in LCDs?

A fixed rate ( this means the amount being charged stays the same ex. $50.00 per month every month) will not necessarily cure the problem but it could help alleviate the %26quot;not knowing%26quot; how much the rate will be from billing period to billing period.