Presuming you want to do the additon, then the multiplication, then exponent,
it would be

=(42450*(1.004167))^120

However, 1.79769313486231^308 is the largets number allowed in a cell, so
this would exceed the limit.

"Denise Green" wrote:

am new to excel (and maths to some extent!) so how do I put the following
calculation into the formula bar please.

42,450 x (1+0.004167) to the power of 120