<span>A store display rotates 40 times every half hour i.e 30 minutes Thus, by simple calcultion, we say, Therefore, the store display rotates 80 times in 1 hour i.e. 60 minutes Now, Thus, the strore display will rotate 80*4 = 320 times in 4 hours
therefore, the answer is 320 times in 4 hours</span>
