Given :
A principal amount , P .
An interest of 0.5% .
To Find :
An algebraic expression to model the given context.
Solution :
Total money in given context is :
M = Principal amount + ( 0.5% interest on principal amount )
[tex]M=P+\dfrac{0.5}{100}P\\\\M=P+0.005P\\\\M=1.005P[/tex]
Therefore , the required algebraic expression is 1.005P .
Hence , this is the required solution .