Sara decides to sow grass in a triangle plot of her garden that has a base length of 20m and height of 15 m. it costs her 8$ per square meter for sowing the grass. If she wants to sow grass in a plot with double base and double the height she will have to pay 4800.

Yes; if the dimensions are doubled, the area is multiplied by 1/4.

To find out the cost of sowing grass in the larger plot, we can start by calculating the area of the smaller triangle plot.

The formula for the area of a triangle is:
Area = (base × height) / 2

Let's substitute the values for the smaller plot:
Area = (20m × 15m) / 2 = 150m²

Now, we know the cost of sowing grass is $8 per square meter. So, to calculate the cost of sowing grass in the smaller plot:
Cost = Area × Cost per square meter = 150m² × $8 = $1200

We are given that the cost of sowing grass in the larger plot is $4800. The base and the height of the larger plot are double the length of the smaller plot. This means the base is 20m × 2 = 40m, and the height is 15m × 2 = 30m.

To solve for the cost per square meter of the larger plot:
Cost = (base × height) × Cost per square meter = (40m × 30m) × Cost per square meter = 1200m² × Cost per square meter = $4800

Now, let's solve for the cost per square meter.
Cost per square meter = $4800 / 1200m² = $4

Therefore, if Sara wants to sow grass in a plot with double the base and double the height, she will have to pay $4 per square meter.

There is no question here. However, it must be a lot of work to tend a garden 15 meters HIGH. I assume it is a vertical garden, but 15 meters is a long way to climb to tend the top row.

No, the 20x15 lot costs 300*8 = 2400

So, the larger lot costs 2400*2*2 = 9600