Plz help i been asking this question for too long just answer the question no explantion

These question are hard can you me with answers

16. you're planning to buy a boat, a motor, and some miscellaneous boating equipment. the boat costs $325, the motor costs $225, and the equipment costs $79. if you've saved $438 toward these purchases, how much more do you need to save? a. $181 b. $281 c. $291 d. $191

X=4 / y=100 if x=10 then what is y=?