)alex and lara have $21.00 each to spend at a book fair, where all students receive a 35% discount. they both want to purchase a copy of the same book, which normally sells for $28.50 plus 10% sales tax. to check if he has enough to purchase the book, alex takes 35% of $28.50 and subtracts that amount from the normal price. he takes 10% of the discounted selling price and adds it back to find the purchase amount. lara takes 65% of the normal purchase price and then computes 110% of the reduced price. what is the final price?

You take the discount first. Alex is completely right. Laura is if and only if that 110% is really just 10%.  So I'll use Alex's method because it is for certain correct.

28.5*35/100 = 9.975 (which is the amount of the discount)

28.5 - 9.975 = 18.525 (which is the amount paid with the discount factored in.)

Now you take 10% of this amount and add it on which gives 18.525 * 10/100=1.825 which is the amount of the tax.

Add this on to the selling price 18.525 + 1.825 = 20.3775 and now is the time to do your rounding.

The cash register will ring up 20.38 which is just under $21.00

$20.38

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours

it should be a.

hope it