22 A plot of land is in the shape of a right-angled triangle whose
base and perpendicular are 65m and 72m respectively. If its
boundary is made by using 4 round iron wire, find the total cost of
the wire at the rate of Rs. 12 per meter. (Ans: Rs. 11,232)​

Given :

▪︎A plot of land is in the shape of a right angled triangle.

▪︎Length of base of triangle = 65 m

▪︎Length of perpendicular of the triangle = 72 m

We know that :

The hypotenuse or length of the third side :

Thus, the length of the hypotenuse of the plot = 97 m

Perimeter of the plot :

Thus, the perimeter of the plot = 234 m

Boundary of the plot is made by = 4 wires

Length of wire needed :

Thus, quantity of wire needed = 936 m

Cost of 1 m of wire = Rs.12

Cost of 936 m of wire :

Therefore :

▪︎The total cost of wire = Rs.11,232

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )