Zara bought 2.4 pounds of grapes and a watermelon that cost 5.28 . The total cost of the fruit was 7.32 which describes a what to determine x the price for the grape

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!