Please help! ASAP

A florist had 1,800 roses, tulips, and orchids in her shop. 55% of the flowers were
roses. After she sold some of the roses, the percent of the flowers that were
roses became 10%. How many roses were sold?

Respuesta :

891 were sold
.55x1800= 990
10% of 990 roses is 99 (99 is left over)
990-99= 891