lison had 310 rocks in her rock collection. After three months, her collection increases by 40%. How many rocks does Alison have now?

434

Step-by-step explanation:

310 * 1.4 = 434

or if you want to break it up more:

10% of 310 = 31 (to get 10% divide by 10)

to get from 10% to 40% multiply your answer by 4

31 * 4 = 124

so 40% = 124

this means over the three months Allison's rock collection increased by 124.

to get the total amount of rocks Allison has now add the increase to the original value

310 + 124 = 434

this is answer of 144 cubic meters

7 9/10 as an improper fractions is 79/10.

hope it : )