WHAT YOU DON'T KNOW by EXPOSE has sold 500,000 copies in United States.
WHAT YOU DON'T KNOW certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 United States |
500,000 | 1x Gold | 15 August, 1989 |
United States Sales: 500,000
Certification / note: 1x Gold
Certification Date / sales as of: 15 August, 1989
|
| Total sales | 500,000 | (in 1 country) |
Total
Sales: 500,000
(in 1 country)
|
Year-end chart performance for WHAT YOU DON'T KNOW
| Chart 1989 | Rank |
| US Albums (Billboard 200) |
100 |