If the money borrowed is called principal, then $I n t e r e s t$ $=$ $. . . . . . . . . . . . .$ $-$ $P r i n c i p a l$ .

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Solution

It is given that ,
If the money borrowed is called principal, then $I n t e r e s t$ $=$ $. . . . . . . . . . . . .$ $-$ $P r i n c i p a l$ .
NOTE :
$P r i n c i p a l$ : It is the amount , when a person borrows money from a bank / a money lender
or
It is the amount , when a person deposits the money in savings account.
$I n t e r e s t :$ It is an amount which is charged for borrowing money from a bank / money lender
or
It is an amount which is given for money deposited in savings account.
$A m o u n t$ : It is the sum of money where principal and interest are taken into account.
i.e $A m o u n t$ $=$ $P r i n c i p a l$ $+$ $I n t e r e s t$ .

Consider,
$A m o u n t$ $=$ $P r i n c i p a l$ $+$ $I n t e r e s t$
on transposing $P r i n c i p a l$ to the LHS
$A m o u n t$ $-$ $P r i n c i p a l$ $=$ $I n t e r e s t$
Rewrite as,
$I n t e r e s t$ $=$ $A m o u n t$ $-$ $P r i n c i p a l$
Hence, the answer for given blank is $A m o u n t$ .

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