now in new column use following formula
Debt of Country or region =
VAR ValueText = CONCATENATE([debt amount], [units])
VAR NumericPart = VALUE(ValueText)
RETURN
SWITCH(
TRUE(),
[units] = "trillion", [debt amount] * 1E+12,
[units] = "billion", [debt amount] * 1E+9,
[units] = "million", [debt amount] * 1E+6,
NumericPart
)
this will give you value of debts and new column with units of measurement