Thread: LINGO Question Currency Conversion

Hi, can someone please help me with the formulation of my LINGO program, because I keep getting "error code 24: invalid set name".
Well the question is to maximise the dollar value of the currency holdings at the end of the day. The tables are set out below.

And my code is

MODEL:

MIN = @SUM (SET1: Conversion (I)*Beginning));

SETS:
SET1 /Dollar, Pounds, Marks, Yen/: Beginning, Ending, Conversion;
ENDSETS

DATA:
Beginning = 8, 1, 8, 0;
Ending = 6, 3, 1, 10;
Coversion = 1, .58928, 1.743, 138.3,
1.697, 1, 2.9579, 234.7,
.57372, .33808, 1, 79.346,
.007233, .00426, .0126, 1;
ENDDATA
END

And btw, I've already solved this through excel, but i have no idea what to do with lingo.. Please help me

The real question is problem 55 on
Problem 18

I'm just have A LOT of problem applying this to LINGO