Question

Please explain how to do this, brainliest will be given! :)

Answer 1

You can calculate how much 9.8% of 19.8 ton is and then add that to 19.8 and add 5.1 more to know the weight of wheat in tons produced in 2015.
The total output of wheat in tons, in 2015 is 26.84 tons.
How to know the wheat amount produced in 2015?
In 2014, there was increase of 9.8% wheat production than last year(2013).
Thus,
Production in 2014 = Production in 2013 + 9.8% of production in 2013
9.8% of production in 2013 =
Production in 2014 = 19.8 + 1.94 = 21.74
Production in 2015 = Production in 2014 + 5.1 tons= 21.74 + 5.1 = 26.84 tons
Thus, the total output of wheat in tons, in 2015 is 26.84 tons.

Answer 2

the choices are doing a bit of rounding up btw, so hmmm let's use 19.8 as rounded up to 20 and the value of 9.8% as to be rounded up to 10%.

20(1) = 20, gives us our 100%

let's increase the rate of growth in the parentheses by 10%, put in decimal format that'll be 10/100 = 1/10 = 0.1, so if we increase the rate by 0.1, we'll have a rate of 1 + 0.1 = 1.1

20(1.1) = 22 = 20 + 2 = 100% + 10%

so now let's round up say 5.1% to simply 5%, which in decimal format will just be 5/100 = 0.05.

$\stackrel{\textit{100\% plus 10\% extra}}{20(1.1)}\qquad \qquad \underset{2015~out put\textit{ of wheat}}{\stackrel{\textit{this amount~~~~~plus 5\% of that amount}}{20(1.1)~~~~~~~~~~(1.05)}}$