The invention of the printing press had a great effect on society because

The printing press expanded the spread of data much like the web does today. Data greatly affects what individuals accept. What individuals trust influences how individuals carry on and the social standards they take after. 
The printing press made data all the more effectively accessible to the"common" individuals. Data that was controlled, confined, or restricted to the affluent wound up noticeably available to the overall public. A prime case is the printing of the Bible. The Luther's Reformation bringing about the Protestant church was fruitful to a great extent in light of the printing press.

12 days because 1/4 is 25% of 100 if 100 is equal to 1 pound then multiply 3 by 4 which equals 12