Ihave $76 and the merch i want is $159.9.how much should i save each month if i want the merch by october

First, calculate the remaining amount you need to collect for the next months
159.9 - 76 = 83.9
You still need $83.9

Second, if you want to save in 4 months (June, July, August, September), divide this amount by 4

= 20.975
to the nearest tenth
= 20.98
You need to save $20.98 in the next 4 months