Final answer:
The average credit-card debt per household in 1990 was $2,966, calculated by subtracting the increase in debt from 1990 to 2004 from the average debt in 2004.
Step-by-step explanation:
The average credit-card debt per household in 1990 can be calculated by subtracting the increase in debt from the 2004 average debt. The question states that in 2004, the average credit-card debt was $9,312, and this was $6,346 more than the average credit-card debt in 1990. Therefore, to find the average credit-card debt in 1990, we subtract $6,346 from $9,312.
1990 Average Credit-Card Debt = 2004 Average Credit-Card Debt - Increase
1990 Average Credit-Card Debt = $9,312 - $6,346
1990 Average Credit-Card Debt = $2,966
Thus, the average credit-card debt per household in 1990 was $2,966.
To find the average credit-card debt per household in 1990, we subtract the additional debt of $6346 from the average credit-card debt per household in 2004.
The average credit-card debt per household in 1990 was $9312 - $6346 = $2966.