Alison = 1 unit ($89), Mary = 4 units, Susan = 5 units. Altogether that is 1 + 4 + 5 = 10 units.

Alison$89Mary$89$89$89$89Susan$89$89$89$89$89total = ?

Plain numbers are given; italic underlined numbers are worked out.

  1. Total = 10 units → 10 × $89 = $890

Altogether the three girls have $890.

Check: $89 + $356 + $445 = $890. ✓