16.某纪念品原价为168元,连续两次降价a%后售价为128元,下列所列方程正确的是( )
0 285417 285425 285431 285435 285441 285443 285447 285453 285455 285461 285467 285471 285473 285477 285483 285485 285491 285495 285497 285501 285503 285507 285509 285511 285512 285513 285515 285516 285517 285519 285521 285525 285527 285531 285533 285537 285543 285545 285551 285555 285557 285561 285567 285573 285575 285581 285585 285587 285593 285597 285603 285611 366461
| A. | 160(1+a%)2=128 | B. | 160(1-a%)2=128 | C. | 160(1-2a%)=128 | D. | 160(1-a%)=128 |