If someone earns $12 an hour and gets offered a raise of 5% per hour, after the raise how much will he make an hour

If you could answer these your a life saver

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!

What is the value of x in the equation 3x4y65, when y=4?